Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf60e314331a7290…

MALICIOUS

PDF

66.0 KB Created: 2020-11-19 04:17:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d17b269c2314e89d723a4bab787e5102 SHA-1: 1b5aa65535cf3615b404008702a4b91bb3ffdad8 SHA-256: bf60e314331a729096320d1a81eb5e55aa6ad5106007509c6d7f884d492f9c37
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 link farm, suggesting a tactic to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://traffking.ru/strik?utm_term=zorro+velho+barderos+letra
    • https://cdn-cms.f-static.net/uploads/4453144/normal_5fb2fbc8a13c9.pdf
    • https://jibisovewa.weebly.com/uploads/1/3/4/6/134653871/a11cc2bc91.pdf
    • https://cdn-cms.f-static.net/uploads/4377128/normal_5fb47130a9baa.pdf
    • https://rakositove.weebly.com/uploads/1/3/4/5/134595637/1298612d500eb57.pdf
    • https://cdn-cms.f-static.net/uploads/4416664/normal_5fabd4f8f3b72.pdf
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5f8ff2045b3c8.pdf
    • https://nulejekenafu.weebly.com/uploads/1/3/4/3/134367691/busiken.pdf
    • https://cdn-cms.f-static.net/uploads/4402706/normal_5faa158d0a08e.pdf
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5fabf0f74b77c.pdf
    • https://cdn-cms.f-static.net/uploads/4373782/normal_5f88bfc9a4adf.pdf
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f871536f05be.pdf
    • https://cdn-cms.f-static.net/uploads/4369917/normal_5f91e0b43c139.pdf
    • https://voligamaxe.weebly.com/uploads/1/3/4/5/134512074/newakevogidalo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/woberiz/79995803142.pdf
    • https://s3.amazonaws.com/setaxilitozuko/43735655313.pdf
    • https://s3.amazonaws.com/nowonovege/pre_ap_biology_study_guide.pdf
    • https://s3.amazonaws.com/xunilukegez/life_skills_health_textbook_answers.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_off0000c4d9.bin
49c70bfe79a772647163ba9d4d10f2d3f16febafa40c57ceb9ece4e485973b72
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D9 5072 bytes
font_01_sfnt_off0000d60d.bin
0e3a7b02cf0efb18960ca39a840e68d5d5d446f4b50437ed711466dc2676b196
pdf-font-stream PDF embedded font (sfnt) at offset 0xD60D 10480 bytes