Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c221fe4d5ecc5e…

MALICIOUS

PDF

58.2 KB Created: 2020-11-19 09:57:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 65c37c0b138a19d03751357a845cf2f7 SHA-1: 11000c32e6dc90a4c0e2f1896d13855baaea72ea SHA-256: c4c221fe4d5ecc5e0dae26c514595d01783edb26fb5a47b15b0f0b67291c100a
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffmen.ru/aws?utm_term=the+ultimate+cigar+reference+guide+poster In PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/lanadez.pdfIn PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/xonol.pdfIn PDF document text
    • https://xanugobolenaz.weebly.com/uploads/1/3/4/3/134371028/655904c472.pdfIn PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/zajupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5fb2e21c4c280.pdfIn PDF document text
    • https://lotisawiro.weebly.com/uploads/1/3/4/6/134625457/aade8a.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/d870d367426.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/027a0ccc-a23b-4b5e-90a6-5f2f3dff6383/64604792031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/759ae924-5639-4430-a1ca-d238a8309d65/home_depot_rebates_11.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/77303679099.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_off0000a877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA877 5516 bytes
SHA-256: 2ea20ba12ad2ee3b06553dc0d7018341f956da26fd5e726a7b4ab37c8cdf0340
font_01_sfnt_off0000bb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0A 9760 bytes
SHA-256: e792e18f6d93d8ba841b44256a6a3c9fe069f5bd0556242728206aecac42654b

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