Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdce20daa3c40ee…

MALICIOUS

PDF

72.5 KB Created: 2021-02-15 18:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bb1c372cad3b15493fd1653970584c4d SHA-1: 3354ea19a66eb653b99b0b1fea8593121a0a0d41 SHA-256: 3cdce20daa3c40eeed7ea46db2368361f337ea6527ce3fdc38d1f071cdbaca02
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to product searches, likely serving as a lure to direct users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=troy+bilt+self+propelled+mower+with+honda+engine PDF link annotation
    • https://cdn.sqhk.co/dasisogi/d0gfGjf/23324656573.pdfIn PDF document text
    • http://disclosures.space/chernobyl_netflix_episode_guidel8v9b.pdfIn PDF document text
    • http://skidki-day.shop/flixster_video_redeems6ucv.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/gdhhTw8/iphone_x_mobile_ringtone_download_mp3.pdfIn PDF document text
    • http://topcabinets.xyz/outlook_2013_attachments_from_multiple_emailsob3b7.pdfIn PDF document text
    • http://the-glow.ru/helix_waltz_clothing_guide8mdg3.pdfIn PDF document text
    • http://indital.fun/273992819604g3am.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_6022317b6b8fa.pdfIn PDF document text
    • http://juilopkiretlo.ru/dopuxalomitisudejojego8pzj8.pdfIn PDF document text
    • http://cmbmarketing.agency/xugejowukubozugaduslq236.pdfIn PDF document text
    • http://instapriz365.online/58917745725to4rc.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/gcFhibA/ninina.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421780/normal_5fde5aebccbdb.pdfIn PDF document text
    • http://hookup681.site/117111137ihs93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taxifegizuni.epizy.com/kuwufinubovimobup.pdfIn PDF document text
    • http://wajodojizofe.epizy.com/glad_monster_sad_monster_worksheet.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_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 5736 bytes
SHA-256: 8522a78d83c9660590c8101589f23707a40bd201bff20b186780e6a4853ef8b3
font_01_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 11184 bytes
SHA-256: 52d50c6fe4c797177f169844d9f2ef7b21c508207cbfc12dddbdf80409b34cb5

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