Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7361aa9b7e2478…

MALICIOUS

PDF

74.3 KB Created: 2021-06-03 19:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef85e3f19af7f7d8e486f5de60534453 SHA-1: 23aa0ff9eacbd39337067acd482a02e34c01a6fe SHA-256: 3b7361aa9b7e24784736f54657489f02859ba7ebffad2530ac8153e9c9f0a9bd
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to link farms or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of 'utm_term' in one of the URLs indicates a potential phishing lure related to search engine results.

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://archism.ru/pbw?utm_term=does+burger+king+offer+breakfast+all+day
    • https://rowisinudusa.weebly.com/uploads/1/3/5/3/135310113/bc8690fd6b6693.pdf
    • https://jagedebake.weebly.com/uploads/1/3/0/7/130738918/6113504.pdf
    • https://jizojalagakamu.weebly.com/uploads/1/3/4/8/134886497/6b13f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kunozulig.pbworks.com/w/file/fetch/144548130/delupi.pdf
    • https://uploads.strikinglycdn.com/files/21b3ce93-6984-478d-aff8-39fc2edeee53/5878886521.pdf
    • http://mogulazedub.pbworks.com/w/file/fetch/144496980/69506503776.pdf
    • http://viluxese.pbworks.com/f/does_sony_bravia_smart_tv_have_internet_browser.pdf
    • http://namikikis.pbworks.com/w/file/fetch/144487449/what_stock_to_buy_in_hotel_assassination_gta_5.pdf
    • http://tagexoba.pbworks.com/f/what_are_the_benefits_and_harmful_effects_of_bacteria.pdf
    • http://xuvabufoj.pbworks.com/f/xojifizagorepe.pdf
    • http://gabekujijud.pbworks.com/f/7170210762.pdf
    • https://uploads.strikinglycdn.com/files/8edb951b-1b67-4f0e-b726-a3d7d67f0256/24027576554.pdf
    • https://uploads.strikinglycdn.com/files/dacb4a85-dc51-4809-95eb-1c17bbdd5a99/kijivikogug.pdf
    • http://jitilabajeko.pbworks.com/f/wh_questions_present_continuous_exercises.pdf
    • http://wudiwiligis.pbworks.com/f/how_should_a_mormon_woman_dress.pdf
    • http://pojaweku.pbworks.com/w/file/fetch/144464157/capsa_susun_hack_mod_apk.pdf
    • http://gosirata.pbworks.com/w/file/fetch/144444417/easy_wrap_dress_pattern_free.pdf
    • http://mibegenav.pbworks.com/w/file/fetch/144466455/how_to_fix_comma_splices_and_run_on_sentences.pdf
    • http://bujolajoxek.pbworks.com/w/file/fetch/144489750/how_to_get_free_v_bucks_without_verification_2021.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e756.bin
69e05fa926dd4904d62492bf439b91ba73563c9058b9d8374ba8733bf76b00de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 5380 bytes
font_01_sfnt_off0000f9c2.bin
7bd122917507c88f586f3987b62be466a43695d79b61f4923bdfe683e4fa70f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 10056 bytes

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