Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc47f1ef5e5fab84…

MALICIOUS

PDF

72.3 KB Created: 2021-01-12 23:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fcf0cad17b86425eb2a3a3c17dc2a982 SHA-1: 42b3773095bd9b08d75933c0c614cf511d010db1 SHA-256: fc47f1ef5e5fab8492003482d917cb4ecdf1c4422380380f7de3c6e12165d0cd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, many hosted on disposable domains, suggesting an attempt to redirect users to potentially malicious content. The PDF's structure and embedded URLs indicate a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=howard+university+magazine PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409818/normal_5fc4cd790928c.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuwegijelo/bwjggcq/mobiwowakakolokodefewi.pdfIn PDF document text
    • https://gutirupivib.weebly.com/uploads/1/3/4/7/134768574/jugebitupa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403415/normal_5fec582980979.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/eefe5b512.pdfIn PDF document text
    • https://site-1176039.mozfiles.com/files/1176039/soremisewozame.pdfIn PDF document text
    • https://kuzeloxowew.weebly.com/uploads/1/3/4/3/134330257/wisirotapixapozo.pdfIn PDF document text
    • https://moxuwurenawa.weebly.com/uploads/1/3/0/8/130874588/kajinugegafobobuper.pdfIn PDF document text
    • https://cdn.sqhk.co/lukedivibeb/fYDCoii/stone_giant_pathfinder_wiki.pdfIn PDF document text
    • https://senabexe.weebly.com/uploads/1/3/4/2/134265557/tefixawuf.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/gduibgh/38604045866.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_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 5380 bytes
SHA-256: 034b83e010a7ced6eee06ed576941b776477db5929ca30a5fe9a7858e9a63019
font_01_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 10448 bytes
SHA-256: b67654f311b033aea3bed8cf2b63c5221083b7bfad5564d04482cc432d9680dd

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