Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df1b4c41aaf4633…

MALICIOUS

PDF

76.5 KB Created: 2021-03-02 14:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 167965f9a6afb2a9898e8e0b05403293 SHA-1: 0083f59366a06e956a64a06136dd5ae3186b8939 SHA-256: 3df1b4c41aaf4633c06f4d9f685b345326e5a723cda24aded6d0c603b0586b3a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'modem compatibility' for Xfinity, aiming to trick users into clicking the embedded links.

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://bologen.ru/123?utm_term=what+modems+are+compatible+with+xfinity PDF link annotation
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/326838.pdfIn PDF document text
    • https://kabijibijeg.weebly.com/uploads/1/3/4/9/134900291/polugu-fogimokin-kemabejoj-ponulus.pdfIn PDF document text
    • http://bimiwefumukiv.22web.org/engineering_drawing_book_free_download_in_hindi.pdfIn PDF document text
    • http://nawabopebi.iblogger.org/86648488242.pdfIn PDF document text
    • http://seomagnat1.online/rujaluv270i.pdfIn PDF document text
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/jazodizab-kamasivazeras.pdfIn PDF document text
    • http://gajelifuluxapov.mywebcommunity.org/what_is_the_basic_meaning_of_the_social_contract_theory.pdfIn PDF document text
    • http://prizinsta24.site/amazon_kindle_4_specsbokpx.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/38494160612.pdfIn PDF document text
    • http://generatorsale.ru/betuwamexuziwuwaxezosoboeqheu.pdfIn PDF document text
    • https://cdn.sqhk.co/mufipofunup/Wibjjjf/jopaximexewafitubani.pdfIn PDF document text
    • https://ninusava.weebly.com/uploads/1/3/1/4/131436980/tumenizoputi.pdfIn PDF document text
    • https://cdn.sqhk.co/baveninale/icijieD/dufemibazajaxulus.pdfIn PDF document text
    • https://cdn.sqhk.co/fozuwasixeja/gdijh8X/my_9_months_app_march_of_dimes.pdfIn PDF document text
    • http://forexgeeks.net/16975504157kc7w0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pupenedu.rf.gd/64703653949.pdfIn PDF document text
    • http://golokelu.rf.gd/nbc4_washington_dc_news_anchors.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/lord_of_the_flies_important_quotes_chapter_1-3.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 5812 bytes
SHA-256: 93be44f7e7e77e2bc8137d4ec55599b3967c2e90f185a5d95ff3bed04ea6036c
font_01_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 10848 bytes
SHA-256: 7f226ab59df605f81a0d9cd18d4d2131f80360bce8726ffd1586bce0253e44ba

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