Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13c89775eeb98f1…

MALICIOUS

PDF

84.3 KB Created: 2021-03-05 03:35:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71772fe7cc885b54a3dc6c272d83da47 SHA-1: 93084bf48d6e107d355c2676329e2a7c50bfa5cc SHA-256: f13c89775eeb98f128f0ae8fb791f8ad61283190968d21cae99292c67c21f8e0
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 appear to be SEO-optimized for various search terms, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a social engineering attack to trick users into downloading further payloads.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=digital+logic+circuit+design+simulation+software+download
    • https://cdn.sqhk.co/wuwexosul/uXgdYih/production_assembly_line_jobs_near_me.pdf
    • https://cdn.sqhk.co/tisewesir/Njduidp/73536814817.pdf
    • https://cdn-cms.f-static.net/uploads/4383300/normal_6032dd4e0eb58.pdf
    • http://intekzafast.online/fosuxokosinumonepaloxffvu9.pdf
    • https://cdn-cms.f-static.net/uploads/4368246/normal_6017a7e54bb82.pdf
    • https://cdn.sqhk.co/naludibeg/jan3uhh/human_fall_flat_free_for_chromebook.pdf
    • https://cdn.sqhk.co/posaleren/TzOJoid/gixuvunapadunev.pdf
    • http://igcopyrightclient.com/bagawurebinumumadox0styt.pdf
    • https://cdn-cms.f-static.net/uploads/4454982/normal_60417ba0b825d.pdf
    • http://brumbum2.xyz/24321426089xrz92.pdf
    • https://cdn.sqhk.co/kinanekoxo/jgBkgiQ/getotir.pdf
    • http://contarinihome.com/89034248059zu7ye.pdf
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5fe381b818a52.pdf
    • https://cdn-cms.f-static.net/uploads/4453118/normal_602873c12c2c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_90e357e6453d42449101e4e11ed6a4bf.pdf?index=true
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_94687991ca9747bf87f237a4bcf3e0dd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2e8b8911-b252-4849-abfb-be7f0ab9733f/convert_photo_to_paint_by_numbers.pdf
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_e6d7e6bda5b5478db4f75e8cc6d8ecc2.pdf?index=true
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_c08e605e29504ceea81e492ddf30231a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/47662c1e-c1b8-4a65-b49a-02b81ebab102/sajog.pdf
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_72f610091ece4d79bd6e3146e9161ab2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a35.bin
1538938a01eebef8e482e14a1b456cdcbcf05fa15d9c3ddad26356df1462863b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 5432 bytes
font_01_sfnt_off00011caf.bin
c12d3c4ff153c9d738ae6e4c5565bc3ae7ab6617a664a15201f74f3720e25504		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 11496 bytes

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