Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ac019b2d0c629d…

MALICIOUS

PDF

80.3 KB Created: 2021-03-07 12:03:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9bd721eb938c9ea7beec7832d850ca1a SHA-1: e5566dbac40bcbbe4c562d9e9fd5daf1eaa12d20 SHA-256: 83ac019b2d0c629d96181516b3edf53be2214bfff88270db508ff3e928142902
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://crophysi.ru/aws?utm_term=icd+10+code+for+acute+cystitis+due+to+e.+coli+infection PDF link annotation
    • https://zumokijux.weebly.com/uploads/1/3/5/9/135966910/ef2c54fe350b72.pdfIn PDF document text
    • http://vsedlyatebya.xyz/barrons_1100_words_appykdej.pdfIn PDF document text
    • https://cdn.sqhk.co/bufudoraxala/HPaihbh/inflatable_bumper_cars_for_sale_uk.pdfIn PDF document text
    • https://wajonurogizi.weebly.com/uploads/1/3/0/7/130738566/gijunemaxumedonapufo.pdfIn PDF document text
    • http://arm-watch3.club/chillara_gang_video_songsewkwq.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/Qiayto3/ratonarejerafuriwe.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/HijfgjY/sony_walkman_mp3_player_software_download_mac.pdfIn PDF document text
    • http://crawlmqyu.space/chiari_2_malformation1a6pb.pdfIn PDF document text
    • https://fuvexowigirupog.weebly.com/uploads/1/3/4/8/134896800/wunedogavidikuvega.pdfIn PDF document text
    • https://gewuvakir.weebly.com/uploads/1/3/4/6/134660990/pakok.pdfIn PDF document text
    • https://cdn.sqhk.co/jivumigen/fjjthaH/78978738917.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2aed058-6bb0-4bc2-8e78-9cec62722680/hp_laserjet_4_plus_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df3c7b3d-821f-4c2c-8d4c-104bfa9093f7/cuisinart_next_generation_burr_grind_coffee_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/why_is_my_brother_printer_not_responding_to_my_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a26aac4-9632-4e6c-988b-1b2fb43a89dc/preface_to_lyrical_ballads_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/break_blade_episode_12_sub_indo.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/wow_classic_warlock_bis_spreadsheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60aa8abb-373f-4241-a040-9050a7bfd736/35102383645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0084a909-c3e6-4936-9220-41d23ffff632/vefajazepitogadotegovawus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/979b754d-9cd3-4ee6-bf5c-c7104fdbc982/madden_16_running_tips.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_off0000fbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 5280 bytes
SHA-256: 72cca9a04745c2ce37a8706b6cbd96d62ad48864abf3c31f69740cdacca6bd6f
font_01_sfnt_off00010dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC9 11028 bytes
SHA-256: 2e4967426b3f593813141cbf4b87a456c82c9152f0af7563483a974c51b0b3ac

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