Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0761341b5e6d477…

MALICIOUS

PDF

68.1 KB Created: 2021-01-30 06:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e9fd70807985074e21d62b9ee38d1904 SHA-1: cca11064045753cea902837fdb7154996ab33790 SHA-256: f0761341b5e6d477ebcc6a79cf27419c83ea61f7795edc1ef4f072eef42f32bd
186 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or distribution mechanism. While no scripts were explicitly extracted, the presence of numerous external URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=immune+to+reality+gilbert+summary PDF link annotation
    • https://cdn.sqhk.co/patagarinixa/gfC0zij/jujetogepipumivejaxafan.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/RIlen6g/8998818127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_5fd28239bd6ec.pdfIn PDF document text
    • https://tozakewa.weebly.com/uploads/1/3/5/3/135398337/6650021.pdfIn PDF document text
    • http://semengergel.ru/zezelokito8v0et.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479710/normal_5ff87f30c89c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_600ff1859c9d4.pdfIn PDF document text
    • https://tafibukazun.weebly.com/uploads/1/3/5/4/135400045/2376459.pdfIn PDF document text
    • https://cdn.sqhk.co/timemowab/dyshcjc/veverefetufaxotuxamaditar.pdfIn PDF document text
    • http://mir23.xyz/all_time_flower_treerxxrf.pdfIn PDF document text
    • http://sokelekife.iblogger.org/kagilipunu.pdfIn PDF document text
    • https://pufizemopuvagup.weebly.com/uploads/1/3/1/4/131407511/fatix.pdfIn PDF document text
    • https://pitefomut.weebly.com/uploads/1/3/2/6/132682610/1816868.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/jhihgfS/sputnikmusic_best_albums_of_2008.pdfIn PDF document text
    • https://gebezemimubitup.weebly.com/uploads/1/3/1/0/131070169/janox-moxetebalo-donisakeludol.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/gjicSHp/tafawupen.pdfIn PDF document text
    • https://sedanafijokam.weebly.com/uploads/1/3/4/8/134888359/pugigeluge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://konugatevokaxot.epizy.com/bhavan_vidyalaya_chandigarh_admissions_2019_20_form.pdfIn PDF document text
    • http://pizibajavodup.epizy.com/nelokejodamume.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_off0000ce1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1F 5184 bytes
SHA-256: 061ff1bd427f64dc203527d2f8e5df52157d37902445d60a2c0f1404a15d2579
font_01_sfnt_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 10460 bytes
SHA-256: bda7a1e1cb84b019d2eb8191aa401802d873f1568eb136321239a0731e1ddf11

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