Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f2ecffecd315f6…

MALICIOUS

PDF

71.4 KB Created: 2020-11-11 14:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61d96d26c97882207ffa70ca6f7ad5ed SHA-1: 7a930f29a042621c036e2361f784801f037610a2 SHA-256: 51f2ecffecd315f6ac0e35f9711892bd7ab5d01854cabba4c2707bdb1674539a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files hosted on services like weebly.com and f-static.net, suggesting a link farm or content distribution network for malicious content. The primary URL, trafficel.ru, is presented in a context that mimics a Hotels.com contact page, indicating a phishing or social engineering lure. ClamAV and ML classifiers strongly indicate maliciousness, specifically as a phishing or trojan distribution vehicle.

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://trafficel.ru/aws?utm_term=hotels.com+usa+contact+number
    • https://cdn-cms.f-static.net/uploads/4420905/normal_5fa7ee19b4b0e.pdf
    • https://patilufadan.weebly.com/uploads/1/3/4/4/134462925/8376021.pdf
    • https://cdn-cms.f-static.net/uploads/4456687/normal_5fa50c90749ea.pdf
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/fa3a8d4.pdf
    • https://cdn-cms.f-static.net/uploads/4369315/normal_5f8ca69222725.pdf
    • https://wijizavop.weebly.com/uploads/1/3/4/3/134309393/942440.pdf
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/bojemabaf.pdf
    • https://lunejuwibamir.weebly.com/uploads/1/3/4/5/134587588/6ac61881f9.pdf
    • https://nitaluba.weebly.com/uploads/1/3/4/3/134348735/2689778.pdf
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f875bebd7421.pdf
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/f05af64111af98b.pdf
    • https://rasetevipumi.weebly.com/uploads/1/3/4/7/134714044/nesativawab.pdf
    • https://ritibamubube.weebly.com/uploads/1/3/1/4/131437410/6718188.pdf
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/fexanipizok-taxeruzuku.pdf
    • https://cdn-cms.f-static.net/uploads/4377656/normal_5fa55a869ae7c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000dae2.bin
1667846e3c22996d693a08b903f8f3ad8c8a379a76a6f341f7b23f5d81c84e70
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 5080 bytes
font_01_sfnt_off0000ec0f.bin
1603f34878c977db03d421621a36c76c0d1892124d260c3e7622eb97a99cf5f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 10888 bytes