Malicious PDF — malware analysis report

Static analysis result for SHA-256 112e9f85538c39fd…

MALICIOUS

PDF

75.1 KB Created: 2021-03-31 08:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52e35d09e731eb753df5c1a485882c30 SHA-1: 66a875fbe22c97f08f3ed599ebb19b114dc4a3d0 SHA-256: 112e9f85538c39fddb331120512d934ddbb8185db10dfbbdcd16ed97aea8db8c
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs, suggesting a link farm designed to host malicious content or redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/aws?utm_term=warcraft+2+movie+download+in+hindi+480p+khatrimaza
    • https://static.s123-cdn-static.com/uploads/4474989/normal_5fe0d4b3dc968.pdf
    • https://fozogefijegajor.weebly.com/uploads/1/3/1/4/131453134/fc217cb19f19f.pdf
    • https://cdn.sqhk.co/nojebimit/hfhiggc/sitizoretejuwajuloxijoluw.pdf
    • https://static.s123-cdn-static.com/uploads/4485166/normal_5ffaf05f84145.pdf
    • https://vamabeloketofip.weebly.com/uploads/1/3/4/3/134344852/6552990.pdf
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/vodifepez.pdf
    • https://static.s123-cdn-static.com/uploads/4366337/normal_5ffabe82afcc2.pdf
    • https://cdn-cms.f-static.net/uploads/4369645/normal_60261ef665a53.pdf
    • https://static.s123-cdn-static.com/uploads/4369494/normal_5ff4712cb96e5.pdf
    • https://rigivopamakor.weebly.com/uploads/1/3/4/8/134869382/6f4065bc825ecd9.pdf
    • https://cdn.sqhk.co/bitizulokiva/NZibzc1/red_ball_4_volume_3_unblocked.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ribowexulo/carrom_disc_pool_old_version_apk.pdf
    • https://uploads.strikinglycdn.com/files/b477ebea-c6dc-4d46-a515-331bcfe7da16/logitech_g_extreme_3d_pro_joystick_review.pdf
    • https://uploads.strikinglycdn.com/files/4dd2d0ba-35b8-4e3c-be7b-971e30859730/what_states_do_you_not_have_to_wear_a_motorcycle_helmet.pdf
    • https://s3.amazonaws.com/xaliwalufoguni/lagil.pdf
    • https://uploads.strikinglycdn.com/files/c65b543c-3ff9-4738-9703-5cbb8af47180/harman_kardon_onyx_studio_4_manual.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_off0000e5b8.bin
8f4880df2fc962d591b69767c2d4a7f9cb159415961409ca19e7ec7474a7efb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 6052 bytes
font_01_sfnt_off0000fa5a.bin
338ace9fe81a7489e7a231ae1fa817bd822b8708234c3990b1c6473affa05d8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 10840 bytes

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