Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47d37f39c8443ed…

MALICIOUS

PDF

75.2 KB Created: 2021-05-24 13:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad6201d4585b7f5cbbdc37a786c7a9e0 SHA-1: ee6e352391f8035c5edab936cbad7caaa974dd1e SHA-256: c47d37f39c8443edb45f37f9f57049505c86787753f51ce2df5f248e7b840dd4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to exploit users via redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=carrom+disc+pool+aim+hack+without+lulubox
    • https://ziluxofizavamo.weebly.com/uploads/1/3/6/0/136009732/a38116eb6db005.pdf
    • https://dupukixulin.weebly.com/uploads/1/3/2/6/132681516/wixeromexif.pdf
    • https://cdn-cms.f-static.net/uploads/4443354/normal_6010f7bca244f.pdf
    • https://static.s123-cdn-static.com/uploads/4418383/normal_5fef11c49dc45.pdf
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/0c0303f677.pdf
    • https://katesagi.weebly.com/uploads/1/3/4/8/134864962/sidexal.pdf
    • https://tutamakut.weebly.com/uploads/1/3/0/7/130776204/7a7ede3859bca0.pdf
    • https://bapajoronugenig.weebly.com/uploads/1/3/4/2/134234589/vobedokider_noguwi.pdf
    • https://xusikezawijuxop.weebly.com/uploads/1/3/1/4/131407227/sevubiramorawituba.pdf
    • https://zedusolurifi.weebly.com/uploads/1/3/3/9/133999882/1353368.pdf
    • https://devojakosumu.weebly.com/uploads/1/3/5/3/135314674/gororerizezulebar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/5304c48a-3c6b-460c-924c-8c564eeaf02c/fun_writing_worksheets_for_5th_grade.pdf
    • https://s3.amazonaws.com/davolazupivowi/sowabidanudefitudojomu.pdf
    • https://s3.amazonaws.com/zunaporam/44712429832.pdf
    • https://uploads.strikinglycdn.com/files/355b5a79-58b0-42b9-8dfe-60d0bef62554/nafivel.pdf
    • https://uploads.strikinglycdn.com/files/a1f0d07d-1271-46d7-967f-f13bb87b6fbc/18143659155.pdf
    • https://uploads.strikinglycdn.com/files/70efd209-67e4-414f-89e7-be4f749238ee/stochastic_calculus_for_finance_ii_steven_shreve.pdf
    • https://uploads.strikinglycdn.com/files/0fd806a9-790f-4852-b1f1-d71e855aa40a/how_to_learn_tableau_online_for_free.pdf
    • https://uploads.strikinglycdn.com/files/fd995616-9be3-41c7-aa8e-be669cbd569e/graco_sequel_65_rear_facing_height_limit.pdf
    • https://s3.amazonaws.com/tejuvonixag/guitar_template_free.pdf
    • https://s3.amazonaws.com/zufaxepixiguxax/bamuvogovinemipexe.pdf
    • https://uploads.strikinglycdn.com/files/489b699a-dd71-4887-a685-1ab75e5f3964/how_to_rig_line_for_redfish.pdf
    • https://s3.amazonaws.com/likadojivivofu/cannonball_lea_michele.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5cd.bin
31e4962a4debb046c1e0eb13053a68020674d6625df1af7cf2fff500986ab154		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CD 5360 bytes
font_01_sfnt_off0000e813.bin
9d23ffb147071b7caa3bae0119b223cff61df10c84a4de18c3c05f075277ade3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 12468 bytes
font_02_sfnt_off000110b8.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 4324 bytes

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