Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1bdd9aa956b9ce…

MALICIOUS

PDF

73.4 KB Created: 2021-01-21 02:47:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: abac7f8aecee036a3fc1a952572d1bdb SHA-1: 149e379d39540471981b32bbb2b61be8a0d09cc1 SHA-256: 9c1bdd9aa956b9ce5978041004d8e84b53c0c91b4f050cb794e44bca2b65ee83
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, and ML classifiers and ClamAV also flagged it as malicious. The embedded document body text, though heavily obfuscated, suggests a lure related to 'Cow evolution hack', likely intended to trick the user into visiting the malicious URL. The presence of embedded URLs and the overall malicious classification strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/123?utm_term=cow+evolution+hack In PDF document text
    • https://static.s123-cdn-static.com/uploads/4446147/normal_5fc906fd95eb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386349/normal_5f9a15fa3cd9e.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/nifTXii/mcmansion_tents_los_angeles.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/ihjfpgf/guide_for_dude_theft_wars.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454172/normal_5fa3bfd7eae9d.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/ihdgcZA/meme_stickers_for_wastickerapps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387433/normal_5faf0d4c5692a.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/jijDYgj/nails_for_you_prices_yonge_and_eglinton.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxoporerom/haBbhri/lovecraft_s_untold_stories_ps4_review.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/H9hajab/70843884361.pdfIn PDF document text
    • https://cdn.sqhk.co/kitobanifamo/Kczgdhd/kepifav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484636/normal_5fa9c1fa6c2eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fudewalazakukug.epizy.com/wumasu.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/ponalosawulofujogud.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/soothing_music_for_deep_sleep.pdfIn PDF document text
    • http://tifureboriva.epizy.com/dedajimivonusiluxire.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/offshore_fishing_report_delaware.pdfIn PDF document text
    • http://wuzisop.epizy.com/give_all_android_versions_and_its_features.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_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 4736 bytes
SHA-256: 86b8bd6c1531efc22c8f626c9f49c3a840e593f779168443274f4a6a13790d85
font_01_sfnt_off0000e9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 13960 bytes
SHA-256: d2566ef64e6d67502c180524937ae76b47ae723205961fd086a1c417b8629636

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