Malicious PDF — malware analysis report

Static analysis result for SHA-256 85eba140d5f048fc…

MALICIOUS

PDF

72.3 KB Created: 2021-05-24 21:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b587ef26459ee9498c793b03b7323c1f SHA-1: 416dc0bc8347cbaff2a1ebf6126f4f57191f0b93 SHA-256: 85eba140d5f048fc36aa4c79dfe3f2eb646a57da461ec86178524155aff1f160
156 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 5

  • 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.
  • 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://vilenefex.ru/strik?utm_term=how+to+write+a+letter+for+salary+certificate PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465556/normal_5fdfd2d629d08.pdfIn PDF document text
    • https://rulusekiraz.weebly.com/uploads/1/3/5/3/135322703/rokufen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476930/normal_60012a743be9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464314/normal_5ff6d327e2f79.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/ca0dd5f51ed05ba.pdfIn PDF document text
    • https://veralekixa.weebly.com/uploads/1/3/1/0/131069874/sajum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453336/normal_6062cb2414fab.pdfIn PDF document text
    • https://dujuzesafe.weebly.com/uploads/1/3/4/3/134355225/7557776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_601d00b5c763b.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/medaliwifufugel/rupaseronemodonikaf.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/epf_withdrawal_form_19_english.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/tiziguxaxowenenegawelu.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/facts_and_figures_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/coin_collecting_merit_badge_workbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/kenikubudusobupider.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_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 5032 bytes
SHA-256: c36512b036671a2a3b5d8fbff2b1e4e78d56be90e29c05f2248d72edc9c6d5eb
font_01_sfnt_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 10768 bytes
SHA-256: dcbda9b3ae839b0112418ad0a283d515fa05e0706f6a16c265c807979dadd871

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