Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e23f7d83525931…

MALICIOUS

PDF

75.3 KB Created: 2020-12-31 16:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 96809d54b52cd938eeb97fb5893f10af SHA-1: e6c22b93abb65782a088e43340f7750b85d66cb4 SHA-256: c2e23f7d835259310b130f5900ff2fb3bbf03649d584e249019bc05604b978fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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.
  • 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://trafftec.ru/123?utm_term=math+connections+potential+energy+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387826/normal_5fd826c56cdff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366031/normal_5fcdd55790593.pdfIn PDF document text
    • https://sarerudaguf.weebly.com/uploads/1/3/4/3/134373173/7b55edc2aac7d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459029/normal_5fcdb050824b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_5fe9f3e0c64b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449630/normal_5fe53f68f1ce4.pdfIn PDF document text
    • https://kudixofob.weebly.com/uploads/1/3/4/8/134891239/sesisija.pdfIn PDF document text
    • https://sekulawovow.weebly.com/uploads/1/3/4/5/134578441/493898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_5fdb3c45722ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420589/normal_5fdcc1cb54b56.pdfIn PDF document text
    • https://nonuvatemex.weebly.com/uploads/1/3/4/4/134443968/tesereri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452398/normal_5fc815301fcd7.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/7f5874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_5fa0a1fd83d24.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/xeropizuwe/99203740909.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_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 5456 bytes
SHA-256: 149f85ae7464316f69ed829530f3305c18a9f0da57b824a4854e013aa158aa0c
font_01_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 11160 bytes
SHA-256: 84bb8147d2ce0e1134ae13919cd56a70ced7d6aa552a3208b8b8ea35b87ca9a7