Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4060ad3d586fe31…

MALICIOUS

PDF

71.2 KB Created: 2021-01-13 07:54:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 778eee720cdfff93ff29c14f829ce605 SHA-1: ea726517871cd35a22f2232307acc8fb45ce77e6 SHA-256: c4060ad3d586fe3190d54787bcbae7aa7f1c17a570cc6728ff9e32412472c456
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting or redirector services, indicating a phishing or link-farming scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure itself are indicative of malicious redirection.

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
  • 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.
  • 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://cctraff.ru/123?utm_term=snell%2527s+law+problems In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_5f9f38f084854.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421460/normal_5ffe840192c3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406771/normal_5fe7f0a27f7e5.pdfIn PDF document text
    • https://site-1166621.mozfiles.com/files/1166621/50129858938.pdfIn PDF document text
    • https://site-1190022.mozfiles.com/files/1190022/demigods_of_olympus.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/8UGaUhD/72884001287.pdfIn PDF document text
    • https://cdn.sqhk.co/junizafuzep/jhhdifY/gatebokadowaja.pdfIn PDF document text
    • https://pegutezupo.weebly.com/uploads/1/3/2/7/132740329/vonaxabatixusesowufe.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/223f4808512.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451028/normal_5ff65124ec7b9.pdfIn PDF document text
    • https://site-1175916.mozfiles.com/files/1175916/first_grade_reading_comprehension_worksheets_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/idghidb/vazerekuxelimugidufunu.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/TQjdyyL/75915038686.pdfIn PDF document text
    • https://site-1168125.mozfiles.com/files/1168125/secret_of_mana_2_player_snes_classic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f972490911ce.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 5332 bytes
SHA-256: 10406b9d00111e93f64ca01344935c16032d5f625f86eafd7d846b17fa311549
font_01_sfnt_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 11432 bytes
SHA-256: 894fbd4978af9e7d267f7756a7efb965fcb51adf7d0fc98b19772dfe2bd30804

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