Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4389fd7abd3eb3…

MALICIOUS

PDF

71.5 KB Created: 2021-03-19 12:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1e09a3cd7f4b52dbc4bedd2db23b1873 SHA-1: 21ad39f956b60dfabd430fab251fd5390de9dd80 SHA-256: 9e4389fd7abd3eb3dad4e51c270fc8eb0194d162254f6af5e2ae07c9bc2af789
186 Risk Score

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 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=cid+all+episode++hd PDF link annotation
    • http://help-feedback-amzn8.xyz/76841384113gglyq.pdfIn PDF document text
    • http://rotirir.mypressonline.com/chair_yoga_for_seniors.pdfIn PDF document text
    • https://cdn.sqhk.co/rumobotituda/ihoggSZ/break_up_in_a_small_town.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/ihCihha/water_drop_live_wallpaper_note_10_plus.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/h3gcrrw/hepatocellular_carcinoma_hepatoma_definition.pdfIn PDF document text
    • http://circulyarkadigital.xyz/body_for_life_approved_foods06ggu.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwebuvowo/ghwsAhf/minecraft_diamond_sword_best_enchantments.pdfIn PDF document text
    • https://cdn.sqhk.co/jobezivozuf/egggeDi/download_shred_downhill_mountainbiking_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/difojcq/norwegian_cruise_lines_stock_news.pdfIn PDF document text
    • https://cdn.sqhk.co/fejovuwov/irehhjj/marketing_definition_business_environment.pdfIn PDF document text
    • https://cdn.sqhk.co/waxuniwite/ORhaD9Z/physical_science_shs.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxogubajo/heajboL/hey_mama_song_muzmo.pdfIn PDF document text
    • http://harkateine.fun/how_much_to_rent_a_skid_steer_with_mulcherl3hb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_c7dbc85bfffb44a988d6ff568489db8f.pdf?index=trueIn PDF document text
    • http://teraropabu.epizy.com/fodajumuv.pdfIn PDF document text
    • http://woxesuguve.epizy.com/darrieus_vertical_axis_wind_turbine.pdfIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_a3281c5547924b7c80bb8944d2db8993.pdf?index=trueIn PDF document text
    • http://nugafafekovad.epizy.com/fugekivigorepu.pdfIn PDF document text
    • http://xunudijumo.myartsonline.com/65803959437.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_3e9fb975c96746ec9b803d05958765c2.pdf?index=trueIn PDF document text
    • http://defizal.epizy.com/how_to_become_a_good_husband.pdfIn PDF document text
    • http://tobewopuma.rf.gd/audyt_bezpieczestwa_informacji_lista_kontrolna.pdfIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_429213c8a40941e6ac90528447adf9c3.pdf?index=trueIn PDF document text
    • http://koduwutuvage.onlinewebshop.net/28232689829.pdfIn PDF document text
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_f12846803b7b4ad093b2833f9b1f6999.pdf?index=trueIn PDF document text
    • http://vamavaremimot.atwebpages.com/33175898461.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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 4856 bytes
SHA-256: 389441b64954f018c1667c754ab6587840f1e370d6e6b10a4991c15b87ad86d8
font_01_sfnt_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 10508 bytes
SHA-256: 110f527890f86b79d1907975bf5d693f31b1b32aa226a2e3a6f31f49ccc964ff