Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4391ca6b0521658…

MALICIOUS

PDF

75.8 KB Created: 2021-03-06 08:20:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c56aa37713eca0905cad1a9203a15de7 SHA-1: c5835e17d48ba91b9417ce71ee2cc635a8672b32 SHA-256: c4391ca6b0521658ecb2eaf8d70fdb0cf14e3320af27ae669b1ae0cf4049c15c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, and one specifically linked to a 'link farm' heuristic. The document body, though heavily obfuscated, suggests a lure related to using a Walgreens infrared thermometer, which is likely a pretext to drive users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=how+to+use+walgreens+infrared+thermometer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416512/normal_600c5d24ba60f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388046/normal_6001caa171213.pdfIn PDF document text
    • http://yozi.store/transitive_and_intransitive_verbs_testv1cm5.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/gcojdha/fusidilopupadibarab.pdfIn PDF document text
    • https://cdn.sqhk.co/pugipepa/iNjeHic/famadukesori.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/hQDgiia/chinese_checkers_board_game_online.pdfIn PDF document text
    • http://kuboduzuke.mypressonline.com/letter_to_my_nephew_on_his_second_birthday.pdfIn PDF document text
    • https://cdn.sqhk.co/sesudegaruta/SihR6sO/army_car_driver_game_online_play.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405945/normal_5fe0a68161f60.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/hiaghDW/ice_cream_cupcake_bakery_near_me.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/kupavasukumaparubipibale.pdfIn PDF document text
    • http://ufenmac.com/kindergarten_math_books_free_download9vj52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_6031f8d140747.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5fef44179bbd5.pdfIn PDF document text
    • http://onlinekartiadesi.com/52832931987acvkz.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/Y6tnmqM/how_to_play_blackjack_and_win_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_6040006cc947a.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/Dhg5QTl/kill_the_creeper_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457014/normal_5fcebbc12b8f8.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/vhgifo2/no_fotos_por_favor_meaning.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/wolexujegetet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wififeju.atwebpages.com/dymo_letratag_100h.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/10902843299.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_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 5376 bytes
SHA-256: ddb1d427478bf7c96373f92cc05c7f3eaa7e999f059bbecb41e36942e773c0c0
font_01_sfnt_off0000fd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 10632 bytes
SHA-256: bd608c25433eba351c23092876108c5eb8781d13af383c7408a3e911188dd263

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