Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb395a29c98a9a57…

MALICIOUS

PDF

77.7 KB Created: 2020-12-04 04:31:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a1f4d984ac808e5d08b64d7695fd203 SHA-1: bab33a554881622efffd606757b27355385a89b9 SHA-256: cb395a29c98a9a57f955161cd2178d8288014e7cc78320fefe38297ac53d767b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, suggesting an attempt to drive traffic to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/aws?utm_term=photoshop+brochure+template+tri+fold
    • https://cdn-cms.f-static.net/uploads/4491688/normal_5fbb2c41991cb.pdf
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fc39e2aefb37.pdf
    • https://dujinagipufamod.weebly.com/uploads/1/3/4/5/134587046/zuvobitapi.pdf
    • https://suduvigil.weebly.com/uploads/1/3/4/6/134697429/701ae94d8.pdf
    • https://cdn-cms.f-static.net/uploads/4445573/normal_5fb862d1d9bf1.pdf
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/juduvorugatu.pdf
    • https://nirawulef.weebly.com/uploads/1/3/4/3/134324477/muxadologeredaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sabobenuwe/tedumigik.pdf
    • https://static1.squarespace.com/static/5fc66f087848ba205d3ecad5/t/5fc75c04ad3e64119244eb52/1606900742031/2020_pba_tour_finals_prize_money.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe04f0645712565400f2f2/1606288624530/gawojuwamel.pdf
    • https://s3.amazonaws.com/fokapikow/canada_food_guide_2019_download.pdf
    • https://s3.amazonaws.com/fefurorobumi/reporting_one_way_anova_table_apa.pdf
    • https://s3.amazonaws.com/wulagisi/easl_guidelines_for_fatty_liver_disease.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_off0000f204.bin
24b95ed28f9c3850517d7cbdc1d5dfb809f015b311eda050a1cd82ade0f1b6d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 5536 bytes
font_01_sfnt_off000104a9.bin
d92ae7cfddf1ff5ea1264670fe8475f64c962a983f1507b02469c5b68422d6ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 11188 bytes