Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fde31231881819…

MALICIOUS

PDF

74.5 KB Created: 2021-02-14 22:58:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9596506c8a4e826c483494bea05b1499 SHA-1: 55f7af800c89d4da2e3d4ada73f4d6e371b84b29 SHA-256: e1fde312318818198e78c159098f84fafab4e075ded5af08ddd386c59d2c384a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://baarspo.ru/123?utm_term=stanton+middle+school+staff PDF link annotation
    • https://vedewoxid.weebly.com/uploads/1/3/0/7/130738666/4756299.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/Xha4J1x/5392842250.pdfIn PDF document text
    • https://wenojobopowegit.weebly.com/uploads/1/3/4/8/134879608/zeralu_zipedoniw.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/7529977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476601/normal_601a193c554d2.pdfIn PDF document text
    • https://kumojazoj.weebly.com/uploads/1/3/1/3/131381946/5836201.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/8953963.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475999/normal_5ffcbb40043d7.pdfIn PDF document text
    • https://cdn.sqhk.co/xidodaxu/jjd4ibP/gamimekurulaselagave.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/uigpjf1/red_alert_transformers_cybertron.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/nozonupezixebug_fexesoxu_lavunumoniboje.pdfIn PDF document text
    • https://vegipojefatelon.weebly.com/uploads/1/3/4/8/134876486/5699425.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403141/normal_5fe2135d06136.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vominobig.rf.gd/ludipadiwedoxarosowineku.pdfIn PDF document text
    • http://jasigobup.epizy.com/kazesifopodiripe.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/old_school_runescape_99_fishing_guide.pdfIn PDF document text
    • http://winemuvigurema.rf.gd/tezeredamagibexado.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/lusiza.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/samibejuv.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_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 5268 bytes
SHA-256: 7c12537658b80013104b2f2785917db4135c8fcdc128208f4ded9f75f6eb884b
font_01_sfnt_off0000f9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 10340 bytes
SHA-256: f92d19b68c941ba2a3182e115f585823ee68047be2732e2f37eced3a9916206a

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