Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5c4c6b36daa1d4…

MALICIOUS

PDF

77.6 KB Created: 2021-02-16 00:24:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 52f4141ac69f60f94b6229f5490a2daa SHA-1: 83a882706efd8d26e4744bc8ce0da8e90acc0e06 SHA-256: 1e5c4c6b36daa1d4cdc83e5d6de32d8a80a44faa59d7da92ad8cf574d2bc5b38
264 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or scam document. It contains a large number of links to external PDFs hosted on disposable domains, suggesting a link farm for SEO manipulation or to distribute further malicious content. The presence of a redirector link further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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) documents that carry no urgency or charge/dispute escalation.
  • 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://crophysi.ru/wix?keyword=stiff+nights+wholesale+for+sale In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424646/normal_600d8a46de0dc.pdfIn PDF document text
    • https://manatelagaren.weebly.com/uploads/1/3/1/4/131437493/punad.pdfIn PDF document text
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/5224358.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/cjj2MxX/best_recipes_caramel_mud_cake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484359/normal_600dbfef4f630.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/ihRgeic/xefegapubiwoxipelojafobaj.pdfIn PDF document text
    • https://degusatujetuz.weebly.com/uploads/1/3/0/8/130813325/a8d3b950a.pdfIn PDF document text
    • https://tozikogok.weebly.com/uploads/1/3/5/3/135330875/soboturexosufo_tuzegolotineza_nolavosina_vujen.pdfIn PDF document text
    • https://tamipabofoj.weebly.com/uploads/1/3/4/8/134876193/062d1c363229c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474206/normal_60185c0494526.pdfIn PDF document text
    • https://jewupoma.weebly.com/uploads/1/3/1/4/131437657/rofeluxerufigo-lotilaluron-xelozu.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxiniraz/hg5ebkr/sasesi.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/8Hic5gj/17748726719.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/caQijig/wildcraft_animal_sim_online_3d_para_pc.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_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 5224 bytes
SHA-256: 7d0c273239f491d62c7fc821d5c646faa4556ed45571d9c1b7308b0edaf2d860
font_01_sfnt_off00010518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 10568 bytes
SHA-256: 7992cd893f5e142fcc1922d8985045646fc4c35ec9e4e9d5a84d5626e86acee6

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