Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc292c9baead8ff9…

MALICIOUS

PDF

72.9 KB Created: 2021-02-24 01:05:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: aa176eff1c14d80e7cc933291136fec3 SHA-1: 0b47c218c84ded33fc047eed804bc6a13f38523e SHA-256: bc292c9baead8ff91bb01efe43c6c3a9991cfa4f01375cd804caa59139ebc2fb
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it contains malicious content. It functions as a link farm, embedding numerous URLs that redirect to potentially harmful sites, including a known malicious redirector. The presence of many links on disposable hosting suggests an attempt to manipulate search engine results or distribute phishing lures.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=singer%20touch%20and%20sew%20model%20600 In PDF document text
    • https://cdn.sqhk.co/gonolesuzam/i9hitii/funny_baby_videos_first_words.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_60134773cebb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482216/normal_5ff3b1804d396.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/Wgjibjb/battle_legion_mass_battle_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/Ugf6jdP/73628845394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_603587001f8e6.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/jbgiJki/samsung_level_headphones_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/9BnyzmS/riverside_drive_thru_halloween.pdfIn PDF document text
    • http://xesifavaner.22web.org/sekalifis.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/ghherjc/54248207914.pdfIn PDF document text
    • https://pakefipeve.weebly.com/uploads/1/3/4/0/134017053/saralavug-gigodutebum-zajan.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/ijMiijj/scrambled_words_newspaper_game_crossword_clue.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/HNZhigf/48387947142.pdfIn PDF document text
    • https://cdn.sqhk.co/zixajofazadi/gjgjasi/black_friday_2020_apple_watch_walmart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419628/normal_5fffcaead0a03.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/941xPZ0/update_event_fullcalendar_jquery.pdfIn PDF document text
    • http://ganolegelaso.22web.org/81301787154.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://supidanerij.epizy.com/rukemivowo.pdfIn PDF document text
    • http://topotiras.rf.gd/nesituturukopazefapan.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_off0000dd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 5844 bytes
SHA-256: 27cd754ffc738e1c65430949302c4b9c7f8e4f02698e593ed5a3004ba7972ded
font_01_sfnt_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 11052 bytes
SHA-256: e2ac66e7eac2a6528c6e5544237b6dfd6c535d2ad309814d87769ff15e478275

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