Malicious PDF — malware analysis report

Static analysis result for SHA-256 2406716499eca5c2…

MALICIOUS

PDF

92.5 KB Created: 2021-02-22 15:29:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e1dbdcbb1a2ce38941cf12d6426ea45b SHA-1: 121658d8d4317ffdf173dc13bc028e7a4aefeffb SHA-256: 2406716499eca5c2a924ec5653bab33c2cae48b121b7ee7e768dcb876ad632c9
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 or SEO manipulation tactic. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially malicious or deceptive 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
  • 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://leonvi.ru/123?utm_term=how+to+get+heroic+adventures+destiny+2+mars PDF link annotation
    • https://cdn.sqhk.co/rewazexi/ggdjaAY/roblox_gun_simulator_pet_codes.pdfIn PDF document text
    • http://moviesaddaa.online/tony_robbins_book_unlimited_powergrozk.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/jCqhajg/kipurapudifoza.pdfIn PDF document text
    • http://formulamoney.top/76110959176209q9.pdfIn PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/jibopadunivomos.pdfIn PDF document text
    • https://jugivukovetid.weebly.com/uploads/1/3/0/7/130739525/9977578.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/1562611.pdfIn PDF document text
    • https://cdn.sqhk.co/naboxolat/hgIpZWD/hangouts_app_apk_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469626/normal_6011974c4f43a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_600d45d499035.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/jdijAnM/kapibonisugubuvuno.pdfIn PDF document text
    • https://jitemino.weebly.com/uploads/1/3/0/9/130969659/topunigaxege.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/gonogebapejulinidev.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_off00012bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBF 5668 bytes
SHA-256: 7573301efbef78f4b55cd7e4f8cb22eea4ebd631ade950306a87762944946e87
font_01_sfnt_off00013efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFD 11152 bytes
SHA-256: 890390e763503b8635f2627df7bf480b08df1dd3959517121c97c5003402d78b

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