Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f31ec148ec4c3d5…

MALICIOUS

PDF

76.2 KB Created: 2021-02-14 02:15:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 75b7133ba64c96d598fa801b8873bd37 SHA-1: c21be4c947a5365dc633e5bd1f9e3038323719a2 SHA-256: 7f31ec148ec4c3d5e1c0401b9cf10d320bd5ff283327e156a5db27dd8f58d1bc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics indicate a potential for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=cell+cycle+coloring+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421342/normal_60223c59cef0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446942/normal_60275e3e0118a.pdfIn PDF document text
    • https://nilemesobipefuj.weebly.com/uploads/1/3/2/3/132303022/fituwusu-ratexulu-likamagaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_5fda0113860d6.pdfIn PDF document text
    • https://togawakavepanef.weebly.com/uploads/1/3/1/1/131163752/vesexamivakaxo_gowifoned_vazivodizirujag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465396/normal_60150054248c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450624/normal_5fcfa63374e58.pdfIn PDF document text
    • https://tovimovu.weebly.com/uploads/1/3/0/9/130969206/wajej.pdfIn PDF document text
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/pozarasumigij_nudexejizid_pojulogu.pdfIn PDF document text
    • https://zokibiruxe.weebly.com/uploads/1/3/5/3/135326092/ranovepe.pdfIn PDF document text
    • https://cdn.sqhk.co/zufutetuwume/dgdlibH/hamilton_guide_events_map_weatherford.pdfIn PDF document text
    • https://mikuzowadakan.weebly.com/uploads/1/3/1/3/131383480/laxaritabijofewage.pdfIn PDF document text
    • https://xidatebomi.weebly.com/uploads/1/3/5/3/135326438/eb27d010176.pdfIn PDF document text
    • https://kumapeforurimo.weebly.com/uploads/1/3/4/6/134664671/2d93f33.pdfIn PDF document text
    • https://cdn.sqhk.co/zapadenom/7DoTfhf/wijivufumomeriponiwa.pdfIn PDF document text
    • https://siximegam.weebly.com/uploads/1/3/1/4/131453251/vorogoviwul.pdfIn PDF document text
    • https://fejilezujew.weebly.com/uploads/1/3/4/3/134340931/6047179.pdfIn PDF document text
    • https://doxifivot.weebly.com/uploads/1/3/4/2/134235468/313d0d9bc97de7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/goviwigax/aiou_ma_admission_fee_information.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/estival_versus_trophy_guide.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 5368 bytes
SHA-256: 1846ba03bf61d4a83b22df4a28593231971db6140e5a7b756f2a6feddabc36b4
font_01_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 10684 bytes
SHA-256: 3493b62343b81325edd8a4d4a5a65dd069a58e3419345e2495a3032bdd4db7b7

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