Malicious PDF — malware analysis report

Static analysis result for SHA-256 0598ff8fa3113951…

MALICIOUS

PDF

66.4 KB Created: 2020-11-23 05:23:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 218af5c57111357b8ee135568b3dab96 SHA-1: e9ac8290790474ad629f02ac506428cb9c286126 SHA-256: 0598ff8fa311395175b646e0042da9d82c69e08e30b803325cf8234d6a4c824f
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded URLs, many of which point to disposable hosting and redirectors, indicating a link farm designed to distribute malicious content or phish users. The presence of a known malicious redirector URL further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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 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/123?utm_term=aggravated+assault+ocga
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/nojof.pdf
    • https://fibovasononeboj.weebly.com/uploads/1/3/4/7/134732795/dunetuterel.pdf
    • https://puzujesojanigo.weebly.com/uploads/1/3/4/5/134504435/e52a1dc.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/3794757.pdf
    • https://sanizazifu.weebly.com/uploads/1/3/4/5/134599836/razimalekelizek.pdf
    • https://pugerazetowed.weebly.com/uploads/1/3/4/3/134341851/2890892.pdf
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/dedf5a8a2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/982070b2-61d5-4ac8-8946-bb8d1cfe5392/prokaryote_coloring_worksheet_answer_key.pdf
    • https://s3.amazonaws.com/jamokaroxoj/aflac_accident_claim_form.pdf
    • https://s3.amazonaws.com/fodose/webuladebixabijosubin.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca0d.bin
abe954928598b0ef5a75a49b0ab616a532cf3fbd5013acb054cff64e8990123b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0D 5156 bytes
font_01_sfnt_off0000dbb1.bin
69351ec5b0ce93cfae7e80846e70a20ba7313fa3570e998c2764b0b17eb0b7fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 9828 bytes

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