Malicious PDF — malware analysis report

Static analysis result for SHA-256 740c9daaaf59b78c…

MALICIOUS

PDF

71.3 KB Created: 2021-02-25 10:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a1c38a50c9904c8f0d4838bc7f32690c SHA-1: 0c9ed154f11d29a3fb78a1967cdf57d4e5c9bebb SHA-256: 740c9daaaf59b78ca238ff5ccc20cfa4c00406540d4a0232463b94697ff74718
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to PDF files with numeric slugs, suggesting a link farm or SEO spam operation. The primary external link points to a URL related to art definitions, which is likely a lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://seumenha.ru/award?keyword=what+is+contrast+in+art+definition PDF link annotation
    • http://kelirajisob.66ghz.com/55705153855.pdfIn PDF document text
    • http://debopuforu.22web.org/dujobo.pdfIn PDF document text
    • https://xadidevoki.weebly.com/uploads/1/3/0/8/130873902/vukewe.pdfIn PDF document text
    • https://nokejulaju.weebly.com/uploads/1/3/4/6/134696540/1992003.pdfIn PDF document text
    • https://loxogekero.weebly.com/uploads/1/3/4/0/134040689/dediko.pdfIn PDF document text
    • https://latibexuwer.weebly.com/uploads/1/3/0/7/130776356/86239388e70bec.pdfIn PDF document text
    • https://lirobepofuneve.weebly.com/uploads/1/3/0/7/130740173/1f23b11.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/nasitevu/52756459603.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/butterfly_coloring_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/27224748703.pdfIn PDF document text
    • http://funadorexizuju.rf.gd/jixagijupazedofalumidaje.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/psicologia_de_la_motivacion_uned.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/blockchain_blueprint_for_a_new_economy.pdfIn PDF document text
    • http://kunivoji.epizy.com/diablo_2_best_merc_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/gloomhaven_mindthief_character_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/60476741873.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/is_the_personal_trainer_exam_hard.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/antaria_online_android.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_off0000dc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 5088 bytes
SHA-256: 5b45569306b05f6e0a6b727de3ce62a7c6238353ab05a03eedb9558a6081ac42
font_01_sfnt_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 10088 bytes
SHA-256: 8571b53aa10ef36469ba0b86ae04c447b926fe25ef31681c9badf810f12fe71b

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