Malicious PDF — malware analysis report

Static analysis result for SHA-256 f993c740db6a7e60…

MALICIOUS

PDF

77.1 KB Created: 2021-05-28 00:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ab54b77781ab7f3465c02c74c8f9e1df SHA-1: 43ec35104bacb84d5775b8c469bad97f7be55e73 SHA-256: f993c740db6a7e603c0cf3d16a948b8307e2e224905ffc00908b10d006275544
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary links points to a URL that appears to be a lure for downloading content, potentially a malicious payload. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=boogie+nights+full+movie+free+download+300mb PDF link annotation
    • https://bavanakeburosot.weebly.com/uploads/1/3/5/3/135302165/3356182.pdfIn PDF document text
    • https://mamowoxu.weebly.com/uploads/1/3/4/2/134265364/0a4da768e81.pdfIn PDF document text
    • https://godebisexizo.weebly.com/uploads/1/3/0/7/130775633/fumivofofukozif.pdfIn PDF document text
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/9290621.pdfIn PDF document text
    • https://nabumeludofava.weebly.com/uploads/1/3/4/3/134373896/2663b6ccc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382413/normal_601c78ef6699a.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/morepitare.pdfIn PDF document text
    • https://duruzamuxe.weebly.com/uploads/1/3/2/3/132302842/kanabo.pdfIn PDF document text
    • https://sonujesenusa.weebly.com/uploads/1/3/4/3/134344018/4615287.pdfIn PDF document text
    • https://moxitamun.weebly.com/uploads/1/3/4/0/134040854/3226951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385011/normal_5fcd1d8b8c49b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379380/normal_6057dd3d64ee8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cee45e3-5a9f-4fa2-852c-6b096abb2d60/bissell_little_green_machine_turbo_brush_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6ef21e1-bf7b-4353-9794-a3729e38d5ed/xfinity_voice_remote_setup_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/670f034f-d677-4d43-930b-ec92c0accfe2/73184818604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4db1f5-9b93-473f-8d6e-c1fe0288af59/lovudorigurusaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f654505-16ab-41dd-b44d-54186f763236/rapoxuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab513084-4ef0-4d4c-a23f-14d758b03bc6/guvegufuxifavud.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 5968 bytes
SHA-256: 6d1542cca58c4d9e5ee2c6f6a20b4753dd5098f2da0ad7b34100c1ee6bbdc7dc
font_01_sfnt_off00010292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 10588 bytes
SHA-256: 257a9698c941e75576fc0e685999e273acd0fe5e9522becbdfb2d4b2487e91e7

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