Malicious PDF — malware analysis report

Static analysis result for SHA-256 361fc3c734947862…

MALICIOUS

PDF

74.5 KB Created: 2021-02-24 20:50:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 42d37ccc1e349b87e2cd8193661140cc SHA-1: eb55f254f1829bf8ae9d4e8f7feb8cd3550aefe8 SHA-256: 361fc3c734947862bae2bc6421023792d17be256b71d7b38f2621d0448d7723b
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL related to "plantronics voyager legend pairing issues". The ML classifier and ClamAV heuristics strongly indicate maliciousness, likely for phishing or SEO manipulation. No scripts were extracted, but the structure suggests it's designed to redirect users to potentially harmful websites.

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://druttle.ru/award?keyword=plantronics+voyager+legend+pairing+issues PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451760/normal_5fc852560fbad.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirurafixi/6fjajip/70450240798.pdfIn PDF document text
    • https://cdn.sqhk.co/pobefozo/dANIjjt/hang_glider_for_sale.pdfIn PDF document text
    • https://fimudelowuj.weebly.com/uploads/1/3/1/4/131455024/dofinukixiwe.pdfIn PDF document text
    • https://xemawegomefere.weebly.com/uploads/1/3/4/7/134736207/1873229.pdfIn PDF document text
    • https://wegekasi.weebly.com/uploads/1/3/4/6/134678838/vawidarulo-vujewazavab-danafig.pdfIn PDF document text
    • https://lugilabujenubo.weebly.com/uploads/1/3/4/3/134320616/229fee.pdfIn PDF document text
    • http://xidakuxekon.22web.org/cecelia_ahern_books.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482023/normal_5fcb1eb588c63.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/jjbghbl/71143871827.pdfIn PDF document text
    • https://gebowajawuma.weebly.com/uploads/1/3/4/5/134582097/e45fa.pdfIn PDF document text
    • https://kaxudafesin.weebly.com/uploads/1/3/4/3/134355678/voxak_gigibomoxadirid_nekus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_6035f7a138778.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kujafugakare.epizy.com/rojegenotikad.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_off0000e5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BC 5404 bytes
SHA-256: d5e6256ff8edd541062acbf45d0f038e4c76c828083244ab18b4ca02c3f06e45
font_01_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10692 bytes
SHA-256: 4cad09f3fae3e42c210d1939e9388ecf640207db1b3bcd4d074114ba725ae495

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