Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a468d46138ce6e9…

MALICIOUS

PDF

81.5 KB Created: 2021-04-10 15:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ba74c57bd02f107260eaa7fd7e3fa3f SHA-1: 670346d5f69957b21f9d0ea40d1b4baace530f64 SHA-256: 7a468d46138ce6e9afea4ba1268b1a2eab37e4b3c4715f24eb328c3eebe0ccb0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document attempting to redirect users to harmful content.

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
  • 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://kuzutuzo.ru/strik?utm_term=how+often+can+you+use+a+water+flosser
    • https://cdn-cms.f-static.net/uploads/4473645/normal_604514bcd2ae9.pdf
    • http://themarkuzmusic.com/15190485777atffy.pdf
    • http://pitushok.fun/18577495150sycq8.pdf
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fe5d77eca438.pdf
    • http://apsmall.space/cse_investor_guideudljr.pdf
    • https://static.s123-cdn-static.com/uploads/4477138/normal_5ff635d1d7ce8.pdf
    • http://laitlabs.pro/tom_sawyer_and_huck_finn_friendshipgovs6.pdf
    • https://cdn-cms.f-static.net/uploads/4410222/normal_606913a77f8c7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_969a0ec3f21d416887f191d9686add5d.pdf?index=true
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_a21c32472af346d3be3c4efa95b490fa.pdf?index=true
    • https://s3.amazonaws.com/jevelel/sezaborenok.pdf
    • https://s3.amazonaws.com/baposivarabuj/34645045102.pdf
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_8d3e2c8e94444316b69f41df81e3858d.pdf?index=true
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_e5f2da6e2eb042f89db05ea1c499e9fe.pdf?index=true
    • https://s3.amazonaws.com/dudurat/update_android_huawei_mate_10_pro.pdf
    • https://76c87692-cca9-4651-be8e-de6412dad411.filesusr.com/ugd/fdad67_e5b91ca496a64118aef96228e100641e.pdf?index=true
    • https://34a711a6-6b77-41b4-a6d5-f55437226814.filesusr.com/ugd/c1ce8b_9166b459db014cbea299cd77a1a257fb.pdf?index=true
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_9707d6f9bf404dbaaa1c2bf36b75fb9e.pdf?index=true
    • 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_off0000f3d5.bin
a502dd801145d4ae9097b6a8a367be7a8e9e80ecd68d4bda35c191dae835a150		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 4864 bytes
font_01_sfnt_off00010484.bin
d54dc09fcbdade9ce22ae2e4baab47024c3e7cdcc050ed55adc3a1e83ddd5e1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 11356 bytes
font_02_sfnt_off00012ac7.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC7 4324 bytes

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