Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9ef4c4a5d6fd4e…

MALICIOUS

PDF

69.8 KB Created: 2021-02-21 02:00:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 099d65fdc27a084a8a9045e18c63ecd5 SHA-1: 7aa3eb3caf6172c923f5790328a33284fe04d4c0 SHA-256: fb9ef4c4a5d6fd4e87f81266f08916c632d9665087e60de0591132d55ad9f355
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous links to disposable domains and known malicious redirectors, suggesting an attempt to lure users to malicious websites. The document body, though heavily obfuscated, appears to be a lure related to cooking recipes, a common tactic in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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://yafferge.ru/wb?keyword=how%20to%20cook%20beef%20ribs%20in%20offset%20smoker In PDF document text
    • http://damvglaz6.xyz/tasenudigonowavijodeseki6pp6q.pdfIn PDF document text
    • http://sale20.site/gurifiwajipiwudivufopfb4y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447263/normal_603192c2e405d.pdfIn PDF document text
    • http://rubka.space/2829317033785euu.pdfIn PDF document text
    • https://cdn.sqhk.co/tepobugu/geCTx75/72283874451.pdfIn PDF document text
    • https://gedesinikus.weebly.com/uploads/1/3/5/3/135323437/labinunas_kotaleloparubeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406820/normal_6027d0e8d401b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475866/normal_5fef72d128a1a.pdfIn PDF document text
    • https://cdn.sqhk.co/someteku/hhmjjeu/battlelore_command_locust_expansion.pdfIn PDF document text
    • https://kolabonedabisam.weebly.com/uploads/1/3/4/3/134398983/gajagukod-jafogit-gewobakukiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485826/normal_601b30c888f21.pdfIn PDF document text
    • https://cdn.sqhk.co/timafewa/hgBMgdO/wolafeko.pdfIn PDF document text
    • http://znasila.ru/72736401042iu2lf.pdfIn PDF document text
    • http://loveworld.club/acculturative_stress_scale_for_international_students_questionnaireegj9o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvazi/2834903120.pdfIn PDF document text
    • http://fawujuvuz.epizy.com/naa_autograph_movie_songs_free_telugu.pdfIn PDF document text
    • http://tewamenuve.rf.gd/how_to_import_bookmarks_from_another_computer.pdfIn PDF document text
    • http://mafolizol.rf.gd/rafek.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/avg_free_full_for_pc.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_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 5044 bytes
SHA-256: 45c73ddb409c53f43ecde567c55a24f43a41e8cf79e5e8d859b05c4a52643580
font_01_sfnt_off0000e7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E7 10096 bytes
SHA-256: 815b46cbd31d8ea6955582db1dd7521a98cdd1f94d22778bcaeb7084fdb8c6e1

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