Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ef91ac835be173…

MALICIOUS

PDF

71.5 KB Created: 2021-03-08 21:24:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80afc1541f29614bb5d0fa8765c2a41c SHA-1: 9f25528548fbbfb0acad6b83f29a711d500ed834 SHA-256: 77ef91ac835be1733082d2b4324a150648f61f3eec47b99c82f477c4427bea10
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are generated SEO-style links pointing to other PDF documents. One prominent URL, 'https://seumenha.ru/wix?keyword=fallout+4+military+frequency+af95+location', suggests a lure to a website. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=fallout+4+military+frequency+af95+location
    • https://cdn.sqhk.co/putuziboki/icWhiih/mountain_sniper_special_ops_forces.pdf
    • https://ragurukenawuxif.weebly.com/uploads/1/3/4/6/134667210/kuzipexol.pdf
    • https://cdn.sqhk.co/bidogefapo/j8LgeF1/tivepijawisipasoruperamiw.pdf
    • https://rebavunegiluzu.weebly.com/uploads/1/3/4/4/134497465/4476000.pdf
    • https://gazewowotom.weebly.com/uploads/1/3/4/6/134616189/4281879.pdf
    • http://zufabud.22web.org/c_sharp_programming_tutorial_for_beginners.pdf
    • https://rupasofo.weebly.com/uploads/1/3/4/8/134892789/tefuxegufubuzi.pdf
    • https://cdn.sqhk.co/bidogefapo/fYBanJn/27819267933.pdf
    • https://cdn.sqhk.co/nowovadizeb/jsGhcib/aerox_155_vva_meaning.pdf
    • https://cdn.sqhk.co/lituxopevuk/wFhdHGB/battle_copters_apk_download.pdf
    • https://cdn.sqhk.co/gevolonovare/7igkAHk/england_cyber_stars_league_predictions.pdf
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/9843621.pdf
    • https://cdn-cms.f-static.net/uploads/4406775/normal_60379550c519f.pdf
    • https://cdn.sqhk.co/fazologim/fejgrje/file_manager_free_download_apk.pdf
    • https://cdn.sqhk.co/tefazaturar/lggZjjM/72218702571.pdf
    • https://cdn-cms.f-static.net/uploads/4428069/normal_601868f75ad8a.pdf
    • https://cdn.sqhk.co/sunomedude/pMeWijE/lixereraxanipuwijo.pdf
    • http://maxitis.22web.org/is_iodine_monochloride_aqueous.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://debukigezi.epizy.com/jekuwanitejifogadomipa.pdf
    • https://s3.amazonaws.com/safenalavojuwu/ultrasound_scan_report_for_baby_girl.pdf
    • https://s3.amazonaws.com/banula/pukejejewitid.pdf
    • https://s3.amazonaws.com/tobovunoberiki/google_chrome_32_bit_windows_xp.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dade.bin
9e104e1b4f15c8c399fc0361452beb5fd41b9d2c8fc9ddac302722597faf94f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 5400 bytes
font_01_sfnt_off0000ed4a.bin
b5befa3f7456ac884f9948dbea109e153cdff338a17b296b547184b2ac222d87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 10240 bytes

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