Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3960c855aa22061…

MALICIOUS

PDF

71.0 KB Created: 2021-05-26 09:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ff010d29065073b76d8db54f6ee2e237 SHA-1: 2b6772e76ed2f86faa8991229a111a8e928ea153 SHA-256: d3960c855aa22061ef59d76b39cc328b1c1a2330f904da78acace8de5597bab0
222 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious redirector URL and the link farm heuristic suggest the document is designed to lead users to malicious sites, likely for phishing or to download further malware. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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 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.
  • 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
  • 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://dafemum.ru/strik?utm_term=le+scale+di+vincenzo+mannino+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4449614/normal_606e33c67556c.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/nepodex_luroz_kanadus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_60273b462002d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_604cecf6839e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474211/normal_6041931b509bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5fc862bed308d.pdfIn PDF document text
    • https://fekiwafotoj.weebly.com/uploads/1/3/7/5/137512649/kobibudune.pdfIn PDF document text
    • https://dirifulezidume.weebly.com/uploads/1/3/2/7/132740871/lubodoranor_vibatavuvafisa_guzekeki_zunufiveguvoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486745/normal_601f2b79e4f09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378381/normal_605d9baa977f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490534/normal_5fe495756ba97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385852/normal_601226a0d46d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412905/normal_600f220d9b5db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469358/normal_5fc8d46611b33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d10119a6-3a80-457f-9c00-acd1a62ea34c/how_to_apply_vinyl_decals_to_curved_surface.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aa43174-2e09-455d-be87-c770ccb6bf1b/troy_bilt_21_inch_self_propelled_lawn_mower_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbda9e25-b26c-4b83-9a3d-5ec0d7e5568f/39619905100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b5f3e4f-fad4-4640-aca6-a8cf63ec0f5f/kapukekudow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb4eee8b-c564-4e52-8f28-6dd5d764bb6b/how_to_reset_epson_220_ink_cartridges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/627b216c-e5a4-4447-a845-cf48f92d82f9/cabinet_vision_11_full_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f717795-8302-46cd-bb66-6d8bec8f1191/rockabye_baby_mp3_ringtone_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64763ec1-044f-4811-a98c-0b602b10c151/why_is_my_oven_not_heating_up_electric.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10750913-b5d3-4f43-85f1-9ed835877d6e/o_que__comunismo_socialismo_e_democracia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5009188-ef8c-4c61-af2c-fcc7930f9455/how_many_calories_in_a_jersey_mikes_original_italian_sub.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_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 5256 bytes
SHA-256: 2a5fa8bc7e5db99f111783db9cefc54bc6fe9a9735732f38566bcea710c5bd32
font_01_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 10116 bytes
SHA-256: bbf7276a41b6d4b2742f35b41c670972a8924ea53becb72c4e84d7245e4502b8

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