Malicious PDF — malware analysis report

Static analysis result for SHA-256 a190f03f9daec2ae…

MALICIOUS

PDF

80.5 KB Created: 2021-03-09 09:07:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2f13decd5e12eea4379f617d4e22247e SHA-1: 5f6a307233091d505742be1c05314b38bef2e378 SHA-256: a190f03f9daec2ae507caa80b87bb2d2195a7429794095fbff0da708ea911cbe
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://xajibur.ru/wix?keyword=philip+novak+the+world%2527s+wisdom+pdf PDF link annotation
    • https://cdn.sqhk.co/sesumaku/cihEgd3/history_watch_full_episodes_of_tv_shows_online.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/6lhfTl4/block_triangle_puzzle_tangram.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/Ercidgc/dorezugif.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/igGFpuB/nununekelupowapojaxegewi.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/hajiida/55313320482.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/IgJCria/rufunefanix.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/7606e29a-67f3-4829-bdea-ce9b7d3e84fa/ticket_to_ride_europe_expanded.pdfIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_ff302cb6f96f49e992534ad41e10c960.pdf?index=trueIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_0f8f587fa8c448498703c4d9388fe8f5.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_dcab102918b547d4a2e2efdf399baf64.pdf?index=trueIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_2eb8e89622234fb3993abbf7d663028f.pdf?index=trueIn PDF document text
    • http://tumutit.epizy.com/how_to_work_out_net_profit_after_tax.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/11396701713.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/the_tale_of_peter_rabbit_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec4234d8-02b1-40c8-adb8-aab230cb988b/raxekidibovapim.pdfIn PDF document text
    • http://notufexunu.rf.gd/irobot_roomba_flashing_orange_battery_light.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/fortnite_aim_trainer.pdfIn PDF document text
    • http://wuxigukupem.epizy.com/jutekudumus.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/vezebuzuzomekokuzedowi.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/battle_net_game_stuck_on_initializing.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_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 5532 bytes
SHA-256: b3248f69fb86f207cbb291562474d07cbf9d181e3b18c48ab2dfd309a2451fc4
font_01_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 10892 bytes
SHA-256: e9917d0d59244c57f7fcf9c5dd27d110898df4bd9427c8bfdd77ab851e10ea8f

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