Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8de20706104fac6…

MALICIOUS

PDF

80.7 KB Created: 2021-06-05 12:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 380d8f8462b320c23dd14b942d9ed114 SHA-1: 91478b6d957230113dd15b0de3c99751119fa220 SHA-256: a8de20706104fac6dfa6e0f6abfaef230029c6a920b3cf5ebde06c12d0e17744
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://philabc.ru/pbw?utm_term=how+much+weight+will+i+lose+on+bone+broth+diet PDF link annotation
    • https://jikidamasot.weebly.com/uploads/1/3/4/8/134874174/2ea477.pdfIn PDF document text
    • https://popibixa.weebly.com/uploads/1/3/4/7/134745137/8655992.pdfIn PDF document text
    • https://lapenemelibi.weebly.com/uploads/1/3/4/7/134708636/629bc61656fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482645/normal_6043877bb9ba1.pdfIn PDF document text
    • https://palujaburufo.weebly.com/uploads/1/3/2/7/132740236/3931195.pdfIn PDF document text
    • https://gonadasefu.weebly.com/uploads/1/3/5/3/135345348/tipilonuluseru.pdfIn PDF document text
    • https://zuvitapud.weebly.com/uploads/1/3/1/4/131406427/d1546a510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_60637ff73a765.pdfIn PDF document text
    • https://salapabozob.weebly.com/uploads/1/3/5/3/135326799/rexijuzed.pdfIn PDF document text
    • https://lomivurusizova.weebly.com/uploads/1/3/4/8/134868764/478c3ba58197cfb.pdfIn PDF document text
    • https://vukijimox.weebly.com/uploads/1/3/4/3/134358494/xufemidag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_6057a12e21821.pdfIn PDF document text
    • https://selemuja.weebly.com/uploads/1/3/4/8/134893326/tosawogolivo.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4406166/normal_60b4591f2edc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_606ae18858ae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_603da7da88de3.pdfIn PDF document text
    • https://xafasujogi.weebly.com/uploads/1/3/4/3/134374351/mebiwonu-dazosururija-pofovexasimeg.pdfIn PDF document text
    • https://tafogufuju.weebly.com/uploads/1/3/4/6/134638326/pubana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481275/normal_5ff6cf4dea3d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476274/normal_6060e40863f60.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 5336 bytes
SHA-256: 072c6f7640161874dc1e5903d1fd128a21be7702829d2e1f225fc6c82396516c
font_01_sfnt_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 10536 bytes
SHA-256: 081014deb7cc8142621f70efa2b74845281de33eb586960801c6e5e07a46e690
font_02_sfnt_off00011fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953