Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e5b93a22945a64…

MALICIOUS

PDF

70.1 KB Created: 2021-01-12 14:22:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9c91d040ec62e9e5d6931e3ffc8b63db SHA-1: c199f43ae7e7735523882aa2a2e783fdd528dc1e SHA-256: 66e5b93a22945a64def8d380dff85062bc64d7c6d0dc88e5ac74d499958ef71b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware through the linked content.

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
  • 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.
  • 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.
  • 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://gettraff.ru/aws?utm_term=giorno%2527+s+theme+sheet+music+trombone In PDF document text
    • https://cdn-cms.f-static.net/uploads/4530910/normal_5fd66ddc8b3f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466366/normal_5fedad289a369.pdfIn PDF document text
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/goniv.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/govosajosawinoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/BidgcNG/10447886055.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/teruzi.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/b85210b89462aff.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/hdhaJjj/mulixumobezidutiwapuza.pdfIn PDF document text
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/3725664.pdfIn PDF document text
    • https://misajutedatid.weebly.com/uploads/1/3/4/7/134755713/48585.pdfIn PDF document text
    • https://xipowabiwakazo.weebly.com/uploads/1/3/4/6/134614187/sonukoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384640/normal_5f8d10cca0639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464869/normal_5fb6e6dcf1350.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD392 5000 bytes
SHA-256: f596767fccfa291c69adb26433ffd3856dc4ae4129864ca184198c06a018ea8c
font_01_sfnt_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 12084 bytes
SHA-256: 18f6822331db30334b9b7a69547923d2a74ce071a843dd97eceff346fcbb8ebb

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