Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c5e7061ab2152a…

MALICIOUS

PDF

75.4 KB Created: 2021-03-28 19:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ec08415306c84b5c57b18b70b3619192 SHA-1: f83b710cd133c1872bef3f23bc2bc6b8ffe33eaa SHA-256: c7c5e7061ab2152aca7f528b16dfe04408d194dcba204dac89cf042d054f2317
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links pointing to various PDF documents hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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://vilenefex.ru/award?keyword=pedagogy+and+andragogy+pdf PDF link annotation
    • http://onlinetyz.xyz/one_clue_crossword_answers_chapter_39kyhoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489414/normal_603ce1b870dcc.pdfIn PDF document text
    • http://cyberlife.store/gluten_free_dairy_free_birthday_cake_recipesp2oua.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5fc8f12d3eda9.pdfIn PDF document text
    • http://uscreditreport.info/22638086174aueta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_604782f887006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_603d38476d6ae.pdfIn PDF document text
    • http://afracheat9.xyz/how_to_replace_water_filter_samsung_rf4287harstinu3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488555/normal_5fd3874c380bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417644/normal_602ea793b946a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_6035808296f2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409819/normal_601405cb0c781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_603cffaf99f27.pdfIn PDF document text
    • http://auto-fishing-rods1.club/32203940240momwz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393180/normal_5fe4161d3766e.pdfIn PDF document text
    • http://javefuxola.getenjoyment.net/biwinofujebamirugikug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_6013a1df6d7d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448746/normal_60170aa454426.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6552665f-f3ce-4070-9f47-7b493df4570a.filesusr.com/ugd/3d88c7_6065074270f64f1f8726a2ebd33ad9b9.pdf?index=trueIn PDF document text
    • http://ximuxulizi.myartsonline.com/english_questions_for_sbi_clerk_2020.pdfIn PDF document text
    • http://fogokenum.onlinewebshop.net/57166781260.pdfIn PDF document text
    • http://kojuvurapamox.myartsonline.com/83322403492.pdfIn PDF document text
    • https://b56e6f12-3f4b-4b75-bc29-9585eb3fba71.filesusr.com/ugd/73f0dd_a8617fe5c0414bf7aa518add8ed90e00.pdf?index=trueIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_4db3bb5c3d844ca59a205cb587663d2e.pdf?index=trueIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_6d54b4aa58da4bd4a31bf70d6016e785.pdf?index=trueIn PDF document text
    • http://lukafimagog.atwebpages.com/archie_comics_sabrina_the_teenage_witch.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_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 5100 bytes
SHA-256: 2bf0577e2058d928569f027c56e6fcdaf662b90976628f6012eaef7df6c3ddad
font_01_sfnt_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 11076 bytes
SHA-256: 79e2de1fcf75a9847eebe13bef229784b953bd7386d5f3041aa3ff760862f47d

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