Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da7ca498e155d73…

MALICIOUS

PDF

80.2 KB Created: 2021-04-06 23:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 48ed9a1f57ae94f977c37065170772cc SHA-1: 9d669c41bdf040ac39430da1cf6e0ca5ae313571 SHA-256: 9da7ca498e155d73dbf0fc41142dac175f7fba3104e378f006ce3d2a3e05914a
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kuzutuzo.ru/strik?utm_term=lenovo+ix2-200+firmware PDF link annotation
    • https://cdn.sqhk.co/gidenateg/fujjuQ9/22499723346.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/wziiL9S/34039590450.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/CvgPgjb/3672652339.pdfIn PDF document text
    • http://gusanod.22web.org/aksara_jawa_kuno.pdfIn PDF document text
    • https://cdn.sqhk.co/rowubuvuke/iH6jche/5095691255.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/Zgggjjc/sasosabamovoda.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/hjNQ9ge/breaking_bricks_with_ball_game_play_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/c3JidmL/57585242223.pdfIn PDF document text
    • https://cdn.sqhk.co/poxufape/ggicab7/liar_s_dice_pirates_of_the_caribbean_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/sPhfeV9/seratovaxadexoxupiburitiz.pdfIn PDF document text
    • https://cdn.sqhk.co/kuretunaba/Thgzjg0/cabify_cancun_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_70d12c3d1fb746e197e4356365501efc.pdf?index=trueIn PDF document text
    • http://siwojanapav.epizy.com/60378023212.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_c8efb292776347e285b12894ccf757be.pdf?index=trueIn PDF document text
    • https://4ceac43d-3374-4736-8926-b47930641487.filesusr.com/ugd/3b1191_83db7a3142e24437a6043ba5ab64bc7f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 4876 bytes
SHA-256: 0a5b67177565114dfd5ee594a2dbfe7919729f80e5aaff03fbd32b22ff36f5e5
font_01_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 10828 bytes
SHA-256: 2046cd9bd2ac5e2aa7fe4490209c1db5ec5cd782a7507cc88172d284d1e446db
font_02_sfnt_off000125e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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