Malicious PDF — malware analysis report

Static analysis result for SHA-256 8652bbc1a33ee84b…

MALICIOUS

PDF

71.6 KB Created: 2020-12-24 22:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99a02fd98d98b10f34124be24ca1510a SHA-1: e867ab6e5852773e19055b8cd9491de38598c707 SHA-256: 8652bbc1a33ee84b4cef85394784cecf7bef4e36205e44841184202f9ea2d3c5
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/strik?utm_term=guide+pes+2016
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/daruwimum_gexokuxolefoje.pdf
    • https://rabepifisusix.weebly.com/uploads/1/3/4/8/134881283/c110c7206ad.pdf
    • https://mowolonob.weebly.com/uploads/1/3/4/8/134874237/dojakifuzibofan.pdf
    • https://cdn.sqhk.co/sozovoja/5ngde6N/ducks_basketball_schedule.pdf
    • https://cdn.sqhk.co/dabeluza/ADidthb/55848717354.pdf
    • https://cdn-cms.f-static.net/uploads/4384028/normal_5fbd2ff6a0d94.pdf
    • https://cdn-cms.f-static.net/uploads/4389084/normal_5fb2e2cb2b226.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/550a4c86-3401-4c37-a04e-ea7b35f95753/wozewekogoturo.pdf
    • https://uploads.strikinglycdn.com/files/e4f1346f-59a3-4bd4-8225-d0c21b161945/test_de_temperamento_word.pdf
    • https://uploads.strikinglycdn.com/files/5815bb71-a237-4431-a562-2200cba6e15a/gokixatepajaxojuxapib.pdf
    • https://uploads.strikinglycdn.com/files/a63519f7-a56a-4a9c-9051-55d19921c94d/73565754138.pdf
    • https://uploads.strikinglycdn.com/files/7cb28427-fe89-4942-8c87-1db368669195/lalozinoninisepugeke.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_off0000dd2a.bin
c4cfa3b997a28777725deecd8702fa6749ab782fc303e5b0485ca22075c74851
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 5124 bytes
font_01_sfnt_off0000eebb.bin
5db0a97038f4138a9cf9830bc85e7e58b63e218707cd5cd34352a469910458db
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 10368 bytes