Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a25ecbb74d83d9…

MALICIOUS

PDF

104.1 KB Created: 2021-05-31 15:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 125d19ad5cb417fbd719b24b8f914510 SHA-1: 5737060271731b4f0248d25208b71418ea6474f1 SHA-256: 83a25ecbb74d83d9a452635516a6d6f3cbd102abb7185b9b0b89ad774d55d84b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a spearphishing attachment used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/strik?utm_term=ciencia+de+materiales+james+newell+pdf+descargar PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486982/normal_5fe2c91b5cdae.pdfIn PDF document text
    • https://wirolubu.weebly.com/uploads/1/3/1/4/131453990/womujisolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392872/normal_601733f2d119c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501374/normal_6034dbae61ea3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409998/normal_603851ec08c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_601d003712267.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414502/normal_5feb91505575a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405674/normal_601dbb4f456cc.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/wusitarevu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4460473/normal_60b10b2495dd5.pdfIn PDF document text
    • https://pafutidosuzov.weebly.com/uploads/1/3/5/9/135989867/zalatibofeb_dedopudirevok_nigeke.pdfIn PDF document text
    • https://sapoluwit.weebly.com/uploads/1/3/4/4/134400990/solaxozodo_tudulo_vejip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387056/normal_606ade8b4e277.pdfIn PDF document text
    • https://javodezupaxut.weebly.com/uploads/1/3/1/3/131380273/kitukadekuzij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490371/normal_6009e6aea9758.pdfIn PDF document text
    • https://tofapugorod.weebly.com/uploads/1/3/4/8/134885187/roberitexetajugotun.pdfIn PDF document text
    • https://bomovote.weebly.com/uploads/1/3/5/3/135398027/gemazaxu.pdfIn PDF document text
    • https://vobelerevofago.weebly.com/uploads/1/3/4/5/134596527/mumorupapapefem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420468/normal_5fcf23495aa46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_6016b57080a40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487641/normal_6039ef4494510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446937/normal_602fccb1d6abb.pdfIn PDF document text
    • https://rifejirofedum.weebly.com/uploads/1/3/4/7/134763588/kawoj.pdfIn PDF document text
    • https://woralolur.weebly.com/uploads/1/3/4/3/134359953/6f1b99145c973c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 6416 bytes
SHA-256: dc7ab62629aba76a2a1ae9c13196ab608952013a673348275611bf62f0f4ec9f
font_01_sfnt_off0001106a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 5548 bytes
SHA-256: 9c9b5ec25f1f66fa4e9925fcfcd2b02cb41fa115b4cce9e692d094954c88949a
font_02_sfnt_off0001233e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233E 12156 bytes
SHA-256: 9c0bab82c363b431b8a01c12db714226085606b781a5ad0b23f43abdd66c4b56
font_03_sfnt_off000149f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F5 11428 bytes
SHA-256: 7f8a77f221ec5d16985e79c4f983137d4358384166b1cd4c13a85ad8af7dc7bc
font_04_sfnt_off0001710f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1710F 16408 bytes
SHA-256: 612ed82f78a661ac55cf80887db8662b4d88bd845336d205ee4da14ba3645621
font_05_sfnt_off00018714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18714 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19

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