Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f18ffefbf17d344…

MALICIOUS

PDF

73.5 KB Created: 2021-03-01 16:04:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 9f36403e3218b82e30c9c4446a86e633 SHA-1: 63d921abd5f09b34a074f7be3b388931a8b0b4c6 SHA-256: 3f18ffefbf17d344004cc9bfe9333ce1b612ad730ca55fc80574bda30afd199c
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating it is likely a phishing or scam document. The document contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users to potentially malicious sites. The primary URL identified, 'https://druttle.ru/strik?utm_term=violent+crime+lawyers+near+me', suggests a lure related to legal services, likely leading to a phishing or scam page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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/strik?utm_term=violent+crime+lawyers+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497685/normal_603923949200a.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/iRRkfhe/79389848818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_6025a60494056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5fd2ac7087dba.pdfIn PDF document text
    • http://sellforce.ru/13889389222xmf8a.pdfIn PDF document text
    • http://wutanumijejol.sportsontheweb.net/19578464246.pdfIn PDF document text
    • https://cdn.sqhk.co/kususarefeja/gjihKJM/wekolukapetefeme.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366969/normal_5ff71a3b30799.pdfIn PDF document text
    • https://lexedixejorew.weebly.com/uploads/1/3/1/4/131438453/5883994.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408863/normal_6007ea23d4b0e.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/jjggjiI/30475002114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486220/normal_6002603736327.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/makud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499021/normal_60134456e5b86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470703/normal_5fe6e275152d0.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_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 5104 bytes
SHA-256: 14ed4959ef6c438e7212ae786758daf2650d01cc41a3540bc71ee4ce30f4e99b
font_01_sfnt_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 10212 bytes
SHA-256: 3e4e34450f367c3d669b7e1697aa915c9a0ded4b937a2242f0c0fcb97dbf85b2

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