Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8d932879b5163f…

MALICIOUS

PDF

73.1 KB Created: 2021-01-17 15:06:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 622f5140526d92e0d95f5a48c667104d SHA-1: 328697699d42fe5658c53754b24da03be01cb655 SHA-256: 8e8d932879b5163fb87380cb35a045b34d3ecc8bd2053b0af13ce06346731578
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many hosted on disposable domains, and one critical URL pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam, leveraging a link farm to obscure the malicious destination. No scripts were extracted, but the PDF structure itself is weaponized to deliver malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/aws?utm_term=fairview+park+police+accident+reports In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f873cb45fa85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530712/normal_5ff24ebadf4d2.pdfIn PDF document text
    • https://cdn.sqhk.co/bowevuva/ihiighq/hill_car_racing_game_download_for_pc.pdfIn PDF document text
    • https://zozilevijuni.weebly.com/uploads/1/3/1/3/131383476/kotunirolosij.pdfIn PDF document text
    • https://site-1168020.mozfiles.com/files/1168020/44900654454.pdfIn PDF document text
    • https://lezanaxowap.weebly.com/uploads/1/3/2/6/132696506/2f22d.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/64abe534.pdfIn PDF document text
    • http://lanufutado.22web.org/77200128252.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/XE6jhj4/jikidepiwemagasedanowudev.pdfIn PDF document text
    • https://roxogarafuxor.weebly.com/uploads/1/3/1/1/131164132/3985414.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/jbiaXja/lozilejabuxotiteb.pdfIn PDF document text
    • https://webifapemow.weebly.com/uploads/1/3/4/8/134890902/ee429ce05d65a5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gugamofizuxeg.epizy.com/fekuv.pdfIn PDF document text
    • http://sarirepenibe.epizy.com/la_belle_personne_full_movie_free.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

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_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 5240 bytes
SHA-256: c05536864362be60d6c6a970f0c2a79983ed87f5840e5d3995232441d04c5a7e
font_01_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 10936 bytes
SHA-256: e0af2ff538949379ed28b698c6443ee05916a92ebb27fc32791a8e9ae208a81e

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