Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc8a63055665d7b…

MALICIOUS

PDF

74.6 KB Created: 2021-02-22 11:55:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 48bf0d89c765217d83073514d9db15f6 SHA-1: 77699e752fd073181832157bffad1b5c49dacc41 SHA-256: cbc8a63055665d7b5055f62fad8c9e4af556d97e968c6c7d2d7715fd1fc77f4f
186 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 hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/123?utm_term=what+is+the+cost+of+pmp+certification PDF link annotation
    • https://cdn.sqhk.co/waxigapo/jchjmgf/video_player_for_windows.pdfIn PDF document text
    • https://dujililapute.weebly.com/uploads/1/3/5/3/135347223/2773649.pdfIn PDF document text
    • https://polavimiwusirew.weebly.com/uploads/1/3/2/6/132681763/nokidim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472186/normal_5fedf42999737.pdfIn PDF document text
    • https://vavuwujaxozu.weebly.com/uploads/1/3/1/0/131070334/f82a921c3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461767/normal_6005337129c3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_602198b0b3e42.pdfIn PDF document text
    • https://dorubirema.weebly.com/uploads/1/3/4/3/134317311/wadejaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_600dcecdb2452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412999/normal_5fdb0540d390b.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/gemibgj/fujonol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475194/normal_602a5002656f4.pdfIn PDF document text
    • https://fezewozigu.weebly.com/uploads/1/3/4/3/134318815/fefewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_5fd6463b031fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459170/normal_5ff9390d49a03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445879/normal_5fd1ed500a433.pdfIn PDF document text
    • https://togajakuro.weebly.com/uploads/1/3/1/4/131409127/ce0aeb8e4d.pdfIn PDF document text
    • https://cdn.sqhk.co/gudopokobipa/cIDmmhh/7071309644.pdfIn PDF document text
    • https://mulomaninivoxom.weebly.com/uploads/1/3/1/4/131437045/b997697a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392668/normal_5fca3a84ac290.pdfIn PDF document text
    • https://libesomed.weebly.com/uploads/1/3/4/9/134904451/2602261.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 5024 bytes
SHA-256: d7ad8cb1a16844750d0129fdf94a2fd408718f057faa187bf1ea0d8adb301535
font_01_sfnt_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 10948 bytes
SHA-256: 7ab863d587076ebebb1912dba8566a89a2575224163668a261dd8e13966f2d94
font_02_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34