Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab25c9077aac6e9…

MALICIOUS

PDF

87.2 KB Created: 2021-05-27 03:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8ff3cb2f5996948817cc1613daf21ce6 SHA-1: dcfc4d9eae3574eb496de2742045a0d3daa62d8f SHA-256: dab25c9077aac6e95b2003bbf1aa212351b7ffdc4d5f25e739106a299eec0b72
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The primary URL, "https://jacksth.ru/strik?utm_term=algebra+2+chapter+7+test+form+2c+answers", indicates a deceptive attempt to provide answers to an academic test, likely leading to a phishing or malware download site. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=algebra+2+chapter+7+test+form+2c+answers PDF link annotation
    • https://nabolonoroxene.weebly.com/uploads/1/3/4/3/134373159/sakorotuxugexuv-bedopodumivuga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385012/normal_5fc6df918483c.pdfIn PDF document text
    • https://takupomowemeb.weebly.com/uploads/1/3/5/3/135314116/9800ae043f5156b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370077/normal_5ffb405a0fb27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_600d06d51197d.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/kelab.pdfIn PDF document text
    • https://detubutil.weebly.com/uploads/1/3/5/3/135348338/penomivon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466151/normal_602284f6c3b07.pdfIn PDF document text
    • https://jatuxifukonexe.weebly.com/uploads/1/3/4/4/134469885/2901145.pdfIn PDF document text
    • https://pakipuxis.weebly.com/uploads/1/3/5/3/135347710/ratuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_6027f346c86b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/02d03ba4-fc88-4a75-88f4-4a6dbdeb95a6/how_to_get_chisel_and_bits_mod_on_minecraft_pe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a12438-9323-4e31-b848-acfc5285f05c/weber_portable_charcoal_grill_lowes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c04f38f7-27cd-40ed-acf2-c4696ed54338/nudapovadobebudanifemux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddfce345-1e4d-4924-a161-33aad350f08f/70956119764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a5e104-81bf-4fa9-a070-b4a4eef78220/lean_startup_l_g.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18e24b81-28bb-47cf-b2a0-a961b87a4026/71897212576.pdfIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 6720 bytes
SHA-256: 814c4a0d5728c1eb23744a350120524e35572e78235b7b9fdb6a1838468d2b3a
font_01_sfnt_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 5600 bytes
SHA-256: 264a223479503835f44365bb79cd0e3475bb13720adc1e816f827181cecca868
font_02_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 11576 bytes
SHA-256: cfda43388543dd05db55c3d4ba8d458a01cd701d02594ca7a9fcecc68576078a
font_03_sfnt_off00012b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7F 16176 bytes
SHA-256: f232b8ee08c9dbca7859a586653f2fc39cbe14c5a4126d815983bf1a9d1133c0
font_04_sfnt_off000140ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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