Malicious PDF — malware analysis report

Static analysis result for SHA-256 459492fe844dcf08…

MALICIOUS

PDF

67.7 KB Created: 2020-11-10 13:33:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9b6e047bc5cfc08b18cec0bc51cc7983 SHA-1: 4b4f9bffab1b2fb6c18f44cecd45a37272fa9bf9 SHA-256: 459492fe844dcf08aea47792ce1e86791aa7582627e6ace3cdfa9cb384fbbaf0
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution.

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://traffine.ru/123?keyword=limiting+reactant+worksheet+1+answer+key In PDF document text
    • https://donasidavojixa.weebly.com/uploads/1/3/4/4/134494786/1991925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426813/normal_5fa9a3619f025.pdfIn PDF document text
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/dixibepiwusi_lenobeg_nijazopixafuli_wisat.pdfIn PDF document text
    • https://bipikive.weebly.com/uploads/1/3/4/3/134342269/6647562.pdfIn PDF document text
    • https://lijowuvum.weebly.com/uploads/1/3/4/6/134624244/kakoripibofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404987/normal_5f98e95df3444.pdfIn PDF document text
    • https://nevijajemiwawo.weebly.com/uploads/1/3/4/3/134340376/wolirepi.pdfIn PDF document text
    • https://jixidaku.weebly.com/uploads/1/3/4/4/134495137/wupulak-rowemudawobamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5fa01ab2cc8d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/badodemebo/36676320496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6870848c-3cf4-4755-b530-dceb1a6b3168/rewesebutetifizowagerut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e56b3e4-6adb-46dd-8371-1c743535e0ed/segundo_molar_superior_caracteristicas.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_off0000cd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9A 5432 bytes
SHA-256: 3ba32d3dca5eec1824e91ac6ebce89f696f56ad941990aea612350b2e4b42bda
font_01_sfnt_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 9836 bytes
SHA-256: 2c529e993a4e00df685b93e1d1e94a9d386bb5327e6e04e57b6de6cfa483b4d4

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