Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b943a84cce8472…

MALICIOUS

PDF

70.0 KB Created: 2020-12-02 12:47:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fe64370c588741c0e13810f96bdadf7 SHA-1: 373bf5e8347b5141cfe0704e8ed01f4eacca9874 SHA-256: 81b943a84cce847272923e541bbfad11207833c294608bab1ee6461d5bec8dee
214 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with multiple heuristics flagging it as a link farm and a redirector to malicious infrastructure. The presence of a link to 'traffmen.ru' and numerous other unknown URLs strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffmen.ru/123?utm_term=scenic+painting+techniques
    • https://xapozate.weebly.com/uploads/1/3/4/6/134698203/zalakorowago.pdf
    • https://cdn-cms.f-static.net/uploads/4451542/normal_5fb3236468c64.pdf
    • https://cdn-cms.f-static.net/uploads/4408993/normal_5fbf5c715cc1e.pdf
    • https://cdn-cms.f-static.net/uploads/4461481/normal_5fc112e4b6dfe.pdf
    • https://fejajeger.weebly.com/uploads/1/3/4/6/134614243/teroga_rubirigirij_nitasujapimele.pdf
    • https://cdn-cms.f-static.net/uploads/4368760/normal_5f93247930d0d.pdf
    • https://cdn-cms.f-static.net/uploads/4368227/normal_5f961fa02b366.pdf
    • https://cdn-cms.f-static.net/uploads/4449012/normal_5fac4ecb6ba07.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/purufiz/akkurat_std_light_font.pdf
    • https://s3.amazonaws.com/bubodeliza/kovepuwofaxenewakeg.pdf
    • https://s3.amazonaws.com/sazixipame/migesimixo.pdf
    • https://s3.amazonaws.com/bepukuba/ib_english_b_hl_paper_2_sample.pdf
    • https://s3.amazonaws.com/kewuxejikiwe/carcinoma_epidermoide_nasal.pdf
    • https://s3.amazonaws.com/besafefaf/17759220558.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_off0000d5cb.bin
bfcf40b580dc5926bb308dcf6105577b6f884e0e15bc95ac2d754858319ab843
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 5296 bytes
font_01_sfnt_off0000e7d1.bin
24d6658f025f00269927e2af880186001f72373cdef7a84872fbb42871246f25
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 10664 bytes