Malicious PDF — malware analysis report

Static analysis result for SHA-256 10376cfffc72c28d…

MALICIOUS

PDF

79.9 KB Created: 2021-04-01 23:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f4e9b4a207b26617e9a525075ea7e113 SHA-1: e56b1c5ccc398a90ab327599dc8c2f67ec51da06 SHA-256: 10376cfffc72c28d9758b7b17eacfaa35c06b208927bc738df490fa511850811
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious sites.

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.
  • 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://xezojetit.ru/wix?keyword=famous+warriors+in+history PDF link annotation
    • https://cdn.sqhk.co/dilobowuz/gngjdjc/wobogujeximobutajiz.pdfIn PDF document text
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/6df269.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/qhav8yl/red_balloon_bookshop_events.pdfIn PDF document text
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/kowajelozijig-sagomuz-pilofawav.pdfIn PDF document text
    • https://puvugaluruwibok.weebly.com/uploads/1/3/4/4/134445294/kutafevirukutix_ludowiwav.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/djaBQib/vex_robotics_parts_fusion_360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498834/normal_603e26892cf9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379374/normal_5ff7752ebcd11.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/fTGDieE/call_of_sparta_hack_2020.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/39732812-4fa2-43ab-b675-60316bdeab03/craftsman_6_gallon_air_compressor_owners_manual.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_53d00129e6ff440194aadcaaf8c4ed1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/729b4de8-b89d-4fc5-94ae-428fdae1bf72/what_does_it_mean_when_my_furnace_light_blinks_3_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb5ce42c-a790-478a-b813-5374a3b7cd61/autocad_2017_online_free_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c6a79a-173e-4412-94c5-d884c6f0a9a7/30902593713.pdfIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_ac04be354b5148ab929228f384c70cef.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_211793f4a4df46ed90c8069fb87db051.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_5c034a3011f34553804daa3b4ae877be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f4c4c98-6a45-4e0f-ac39-1f67175a3cf2/duzizunekazowoxuzu.pdfIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_8035d387559b40ef9d6c04bc28020bc5.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 5040 bytes
SHA-256: 5f317011d3918c2241b45f92d5f36ce1443b1f115bdcbdf569aebfb2e30f6ed6
font_01_sfnt_off00010ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 10912 bytes
SHA-256: 35a5fe771bd9e649fbbc7b537f9ccd08f69fb9671d6a132acc852bc2d7d21006