Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3923a990a148763…

MALICIOUS

PDF

64.7 KB Created: 2020-11-13 09:28:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 10244860da34510818c0c8f60e6deb91 SHA-1: 15841e21d75df9bd29545706ded67051987649cc SHA-256: c3923a990a1487636f991c2846dbf66c319fdf0215c73a986318b0676243fcee
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://traffnew.ru/123?utm_term=history+fair+2020 PDF link annotation
    • https://lizotolagodega.weebly.com/uploads/1/3/4/4/134495854/timumizujun.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/674536.pdfIn PDF document text
    • https://xizogezoki.weebly.com/uploads/1/3/4/7/134717510/ferejubibuvak.pdfIn PDF document text
    • https://letenusesek.weebly.com/uploads/1/3/4/3/134310332/wofemaju.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/kuxeb_jesusageb_limurub.pdfIn PDF document text
    • https://kejemixixuroguw.weebly.com/uploads/1/3/4/5/134530022/linuv.pdfIn PDF document text
    • https://pojosividadom.weebly.com/uploads/1/3/4/5/134524524/1179d0.pdfIn PDF document text
    • https://rirusiwox.weebly.com/uploads/1/3/4/2/134265342/5810856.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/aae999d0-c1de-454e-9330-ec43ff52782c/11544757150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaea28a2-5704-401f-b4cc-0ae2d99c5f54/71907967301.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_off0000c1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EF 5064 bytes
SHA-256: 8218da93c86fd1fe8157d6d67d7ea94ea6b6fdb11f0ce36722bfaf4fdaadeedd
font_01_sfnt_off0000d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 10356 bytes
SHA-256: 2fd6b144d2987075ab04391814bea895924346351558bb47c4ae7d8ee8742d32

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