Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a43c0cfaa3aee48…

MALICIOUS

PDF

75.2 KB Created: 2020-11-12 22:04:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a59f221d3f3c4988a73ff7bb07d752ca SHA-1: 74a71e4655032628f589c43536e3d8eeea0f375e SHA-256: 0a43c0cfaa3aee48422a675c6f20db29d74458f12b726b29d31de7a005ca2cac
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the embedded URLs. No scripts were extracted, but the structure points to a malicious document designed to redirect users.

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://traffine.ru/strik?utm_term=ffxi+return+to+delkfutt%2527s+tower
    • https://cdn-cms.f-static.net/uploads/4456399/normal_5fab39bebc71f.pdf
    • https://cdn-cms.f-static.net/uploads/4444098/normal_5fa8429e9afb1.pdf
    • https://botomaluxezevip.weebly.com/uploads/1/3/4/3/134340767/wuraxujojeb_xesenux_vuwuberawiv_ligijekagimone.pdf
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/7131209.pdf
    • https://sokufadatapa.weebly.com/uploads/1/3/4/4/134474271/5517950.pdf
    • https://cdn-cms.f-static.net/uploads/4375894/normal_5f8fca82ec112.pdf
    • https://cdn-cms.f-static.net/uploads/4371800/normal_5f896a5a325fc.pdf
    • https://cdn-cms.f-static.net/uploads/4417030/normal_5f9b48accdfbc.pdf
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5f90abe2821c7.pdf
    • https://fibuwuvonej.weebly.com/uploads/1/3/4/2/134265895/wafagipavaxewo_nijoja_juvoka_bopunubod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/45ce0f00-0625-41b3-a345-cabc94ec1d1b/37871019037.pdf
    • https://s3.amazonaws.com/bisute/mercruiser_140_manual.pdf
    • https://s3.amazonaws.com/sezebepit/minapalot.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_off0000db1a.bin
335135905faca7cbe1a34035d7ad7e3cd390e44c5000767f9a5a55309078973e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 4788 bytes
font_01_sfnt_off0000eb90.bin
517c60e445438acda401e31372a6043b509fe7dc3557d9d99495f02b15bd4d73
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 11220 bytes
font_02_sfnt_off000111cd.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x111CD 4324 bytes