Malicious PDF — malware analysis report

Static analysis result for SHA-256 999b8cede75604a3…

MALICIOUS

PDF

73.9 KB Created: 2021-03-08 02:08:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 84ce7bb6d1d8fed1ae88ca66bd53f1a5 SHA-1: 5d06860bf9cfb745c5b4de445ce4c3b6138e1610 SHA-256: 999b8cede75604a358f411216e249e2c2173dcdab28a3e2dd6abdeb724f8b179
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://nipisod.ru/wix?keyword=naza+flight+controller+setup PDF link annotation
    • https://cdn.sqhk.co/nexasolonit/sZQigjg/roman_tower_defense_games.pdfIn PDF document text
    • https://cdn.sqhk.co/kenoramof/WhbEhge/slice_ice_cream.pdfIn PDF document text
    • http://sollabs.xyz/71666512134t0lb1.pdfIn PDF document text
    • https://febawamowezifu.weebly.com/uploads/1/3/4/5/134594075/joxux.pdfIn PDF document text
    • http://amst-watch-v1.club/crazy_for_speed_2_unlock_all_carsusfzo.pdfIn PDF document text
    • https://zutiwijutorezaz.weebly.com/uploads/1/3/4/3/134354078/nevil_pewarogan.pdfIn PDF document text
    • http://probmake12.xyz/castle_defense_2_mod_apk_rexdlyotgs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sezebepit/udit_narayan_song_wapking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a78f6175-5638-4c51-b610-bf35ec5a9e07/79774254217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b43b0df-0d47-4342-9b14-0a697881e7c8/23173674297.pdfIn PDF document text
    • http://mijunuwe.epizy.com/mupudajolad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b4abe74-f6e6-47ca-98f1-0a542a697542/17214121310.pdfIn PDF document text
    • http://danobefaxejo.rf.gd/zenezezevotixixewagosaso.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/regadokenelowu.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/fezofovazozep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/396c0342-0e9c-44dc-8730-2a5769173564/chiron_the_wounded_healer_astrology.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/how_to_adjust_top-o-matic_cigarette_making_machine.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_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 5296 bytes
SHA-256: f0b6077e2c186fb7dad61685bfc258eb2b067163a340b488c8b698900781bc69
font_01_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 9832 bytes
SHA-256: 569dd9cc665c01e239ef9d9580515143ab8d32596d87c38b25694b963391249f

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