Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c09d85d2a60a9b9…

MALICIOUS

PDF

103.8 KB Created: 2021-05-05 17:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c09691164acf0fc535b1e3f26a276fc7 SHA-1: d63a2cd9f675d7ef60233db7f9f3d1369d9c002e SHA-256: 2c09d85d2a60a9b933d7c54763a9e1d068a06b2e7af22824101cd5fe1449d7ff
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 pointing to PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these external links. While no scripts were explicitly extracted, the PDF structure and heuristic firings point to the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=how+many+rainbow+fish+in+40+gallon+tank
    • https://static.s123-cdn-static.com/uploads/4413361/normal_5ff8b4fa9d44f.pdf
    • http://larijasetejupaz.mypressonline.com/72142988939.pdf
    • https://static.s123-cdn-static.com/uploads/4393485/normal_5fcc2d048b864.pdf
    • https://cdn-cms.f-static.net/uploads/4413226/normal_6009eae82770f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c3f0ce02-b953-40d9-b94a-e38a054f9a35.filesusr.com/ugd/7afb62_087c267cce73440ab5b5001c0e881b03.pdf?index=true
    • https://uploads.strikinglycdn.com/files/247fa3b7-cf98-4c71-aae0-33ab296f1ea0/54517625349.pdf
    • http://zonurupadul.atwebpages.com/analisis_economico_definicion.pdf
    • https://uploads.strikinglycdn.com/files/a5cc6605-5d0a-468b-9b6d-fde68c21fec5/how_is_annual_leave_pay_calculated_nz.pdf
    • https://uploads.strikinglycdn.com/files/5fa0bd6e-2820-447c-bf5c-e405190e566d/wepovuronifatapuvut.pdf
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_0340040af1da414194a25e6eb7f61086.pdf?index=true
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_c7ffa2bffb2745b1870d81d14c6abe8c.pdf?index=true
    • https://s3.amazonaws.com/fulazelof/fotamozu.pdf
    • https://uploads.strikinglycdn.com/files/1ae8cc23-a248-481c-afb4-a42b8d3f7a7f/how_to_solve_a_3x3_j_perm.pdf
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_8016105c6f1746dcbe4712f7883d88af.pdf?index=true
    • https://s3.amazonaws.com/sorogamat/42111558620.pdf
    • http://jabodegodonirad.atwebpages.com/49337446201.pdf
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_ff770b1bc01b41efbe9d68edc6abff3b.pdf?index=true
    • https://s3.amazonaws.com/satudifin/39618449281.pdf
    • https://s3.amazonaws.com/vutame/chicco_keyfit_35.pdf
    • https://uploads.strikinglycdn.com/files/dfdcbe4b-d40f-4123-ba44-04b8af748c8f/30373141673.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015634.bin
236ffd9793d7d8d6a6e4777147eb683861c1ae1a14b886531c728bdfafeef690		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15634 5772 bytes
font_01_sfnt_off000169c7.bin
cfeeaa29ff022efca9e58e6ef198ef4ccd9789775915147ba2939b1f0f1db246		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169C7 11112 bytes

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