Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5dcf759c22febb6…

MALICIOUS

PDF

73.6 KB Created: 2021-02-15 14:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e57ba0cae89dbbc2ceaa1e1c64621779 SHA-1: 4945401252aac539f24266c8cc11262038021d0b SHA-256: e5dcf759c22febb66dbe9674e5664d43bec3c78fd59443bf5326dca20c06dc5b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO poisoning attack. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=how+to+create+income+statement+in+quickbooks PDF link annotation
    • https://cdn.sqhk.co/jejefudebuxi/Mhi5jaZ/gravity_falls_season_3_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/cihifdt/golf_magazine_top_100_usa.pdfIn PDF document text
    • https://ximetekorexuven.weebly.com/uploads/1/3/4/4/134489871/budekebeb-nijupikuf-timaj-vovusutuguforeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416790/normal_600135959d189.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/jhx2ugd/jojelubuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/dFjbieh/shake_the_monkey_tree_newquay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454426/normal_60183e19aa63c.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/jc9Jicx/40182379303.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/jb5idjg/39758162086.pdfIn PDF document text
    • https://figapizezedop.weebly.com/uploads/1/3/4/3/134364787/4772689.pdfIn PDF document text
    • https://cdn.sqhk.co/rotelizedo/jgieF9x/narakejeg.pdfIn PDF document text
    • https://kepubaxolawava.weebly.com/uploads/1/3/4/7/134703856/raguluguxaxigaduxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427526/normal_5fffb53042a96.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/XjaB3ie/84339175814.pdfIn PDF document text
    • https://cdn.sqhk.co/nitagalut/KA9jc0D/fast_racing_league_ost.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/jhfjjgg/classroom_management_strategies_for_secondary_school.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/8jdgg0H/vokosovozikenebinige.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447280/normal_5fc9696d6393c.pdfIn PDF document text
    • https://zanixikowupu.weebly.com/uploads/1/3/1/4/131437740/71d23e5e0fc.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/bgfu4w9/zynga_slingo_game_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 5296 bytes
SHA-256: a02fd8fb1004591a98064dc3df83b86fd1e6b5a2a21f869e87c0b8dceee4bdd8
font_01_sfnt_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 10480 bytes
SHA-256: 5fff01af29728594c4155a8bd342fce89913c0a5580d6864fe170c203bc5d512

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