Malicious PDF — malware analysis report

Static analysis result for SHA-256 5caa71dc4e981955…

MALICIOUS

PDF

80.8 KB Created: 2021-05-28 22:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cf6cac9b57e4f0dae69e86e231d93375 SHA-1: 229a4ea425a1f62f55a83477cf0bb2ac09fe04d8 SHA-256: 5caa71dc4e981955cadeeb672b2230679cea7c058723a13cb09ab476232fb063
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=photosynthesis+and+respiration+pogil+quizlet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445888/normal_5fff0496d3aa8.pdfIn PDF document text
    • https://xutogimumunode.weebly.com/uploads/1/3/4/3/134375265/fd591b511a04c85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471474/normal_5fc5703675d0b.pdfIn PDF document text
    • https://mexejafulid.weebly.com/uploads/1/3/4/8/134880369/sinux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427795/normal_60288894c7227.pdfIn PDF document text
    • https://medefali.weebly.com/uploads/1/3/4/0/134012737/forizofokuravosiz.pdfIn PDF document text
    • https://moremutinujiti.weebly.com/uploads/1/3/4/8/134865562/tugediwutag-podamibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470014/normal_6062d92bae4c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_6062dbdca8bf6.pdfIn PDF document text
    • https://tipujinozubuva.weebly.com/uploads/1/3/4/8/134883375/4203908.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427504/normal_5feb5b28f05f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_60686bf8b9315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_60216cf1024f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420434/normal_602182928a9d1.pdfIn PDF document text
    • https://kawavugin.weebly.com/uploads/1/3/0/8/130874435/xegabelepax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409254/normal_604afaaae2ae0.pdfIn PDF document text
    • https://gakutuzopekok.weebly.com/uploads/1/3/4/6/134605442/9183351.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414678/normal_5ff0a269739cb.pdfIn PDF document text
    • https://vamofelew.weebly.com/uploads/1/3/5/3/135398798/7b4c4.pdfIn PDF document text
    • https://fujelaxu.weebly.com/uploads/1/3/4/7/134704358/ff9b1.pdfIn PDF document text
    • https://kogemopisita.weebly.com/uploads/1/3/0/7/130776015/8b77a8858f13d25.pdfIn PDF document text
    • https://seligelota.weebly.com/uploads/1/3/1/4/131453084/85b2730116.pdfIn PDF document text
    • https://nogikukejigili.weebly.com/uploads/1/3/0/8/130873965/jetilejomiz.pdfIn PDF document text
    • https://nisozamiroxub.weebly.com/uploads/1/3/0/9/130969329/luseradipova-fowivejig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501383/normal_603eade29f222.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 5500 bytes
SHA-256: fb4245caa86a22d740a102b94b5eeed2e57ce3259c1507b01092061abe8452ce
font_01_sfnt_off0001121d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121D 10296 bytes
SHA-256: aca16b6aa80d1f615db87950c5f100223e7d9f295c698ecd0298ce386737e1a2