Malicious PDF — malware analysis report

Static analysis result for SHA-256 858beb632c61f82a…

MALICIOUS

PDF

68.7 KB Created: 2021-01-12 18:57:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 744e27befcf8e73403aa001afb5228fa SHA-1: ed8bc656eea0c8cb6494bb1e7996da21b09cd595 SHA-256: 858beb632c61f82a39c26babdb08256f5a93929e1a85fbb7fffd52df87e25551
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate malicious content, specifically classified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=tutuapp+pokemon+go PDF link annotation
    • https://cdn.sqhk.co/likamigid/ehdjigh/marvel_runaways_season_3_episode_8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498404/normal_5fb6c505dc444.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/Z63F8ji/playstation_4_price_gamestop.pdfIn PDF document text
    • https://site-1218543.mozfiles.com/files/1218543/authorization_to_release_medical_information_form_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/bUjhSAe/42763550829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474462/normal_5fdc880e7f4f1.pdfIn PDF document text
    • https://cdn.sqhk.co/safimowexaw/iahhhhi/fear_the_walking_dead_season_4_episode_1.pdfIn PDF document text
    • https://zonilalafujagep.weebly.com/uploads/1/3/4/7/134731182/6f5ac5a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454052/normal_5fe816e650731.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/buxoparadazegu/68064551184.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/46815187205.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/pijodejejopape.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/interview_preparation_tips.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/rigowipivofebowoverim.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_off0000d1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 4844 bytes
SHA-256: cb79273df65bccb7dcce71a7284fd08f880e9d25bca4c514369181b3ee4bf693
font_01_sfnt_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 10620 bytes
SHA-256: 3e253efe2336c1fe47d6c76ffe6f3e74dc3ca9a3c2ca548c422cc9d32aa9797b

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