Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd20e1b72c1b6b0b…

MALICIOUS

PDF

73.5 KB Created: 2021-02-01 03:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 17fb419e7b8d01a77eb4fc4959067452 SHA-1: 77e61a1d9d3251e2cc43731be6cdd5c1a3c7562f SHA-256: bd20e1b72c1b6b0bfdd4742f31169df8c053bcbbe6cfd16dfa708e7846986404
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, with a high likelihood of leading to further malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

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://baarspo.ru/123?utm_term=wj+iii+cog+subtest+descriptions PDF link annotation
    • https://punopofogow.weebly.com/uploads/1/3/1/4/131437229/wekonek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_5fd68a17053a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471474/normal_5fd87298a9d09.pdfIn PDF document text
    • http://vunekopewode.22web.org/31005580242.pdfIn PDF document text
    • http://obschee.xyz/77472275297vlph5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407991/normal_5fe448d1a9288.pdfIn PDF document text
    • http://rocketdocs.us/5e_versatile_trickstertdz1w.pdfIn PDF document text
    • http://businessmentality.com/botigigamasuto0uye.pdfIn PDF document text
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/9c2c1e7a5018f.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/vuforewebub/connotative_denotative_worksheet_middle_school.pdfIn PDF document text
    • http://dufexisoji.rf.gd/shiva_cartoon_hd_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/tixununekukapevaxomif.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_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 5228 bytes
SHA-256: 47d1d48dba571b3d8ecdfbaaf8307cd5f57a7f17893aee0c334d4351a3fc7e57
font_01_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 10524 bytes
SHA-256: ec4b2430b7227f67ecec32ac4af31f45ff7287d24af48819ee1d9d96d23cf7ed

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