Malicious PDF — malware analysis report

Static analysis result for SHA-256 74218cecaa02d193…

MALICIOUS

PDF

78.3 KB Created: 2021-04-08 06:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 429b1f304c3e8991b5e322468b14f36e SHA-1: 517a3f6eaad12b45b3cdc57b827183dca0cdbf49 SHA-256: 74218cecaa02d1937c1b9a28a1c7e4adb995b9b39682c622f61814d57f98410e
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 0.9992

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://jumiwimov.ru/123?utm_term=grave+of+the+fireflies+sheet+music+piano PDF link annotation
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/7662092.pdfIn PDF document text
    • http://nuxefigemotak.22web.org/agenda_template_for_meetings_word.pdfIn PDF document text
    • http://mujezinej.22web.org/what_are_the_principles_of_life.pdfIn PDF document text
    • https://buxipowuno.weebly.com/uploads/1/3/4/3/134353207/600db3db29091ba.pdfIn PDF document text
    • https://cdn.sqhk.co/raguwubives/zrnIjaW/gijomutabimem.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/hbhegdP/fashion_plates_website.pdfIn PDF document text
    • http://lisexodufebe.22web.org/11455341250.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/akidvia/how_are_dividends_recorded_on_balance_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/hcielbQ/zototapova.pdfIn PDF document text
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/mogofavuluga_fixep.pdfIn PDF document text
    • http://rapelubide.22web.org/1557771459.pdfIn PDF document text
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/wiwinabivasipo.pdfIn PDF document text
    • https://mufudenufasos.weebly.com/uploads/1/3/4/4/134492520/dunasuk_pavibirutoba_rufog.pdfIn PDF document text
    • https://cdn.sqhk.co/sepexapubu/ivifAid/kexisalazutovovi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nelipofamarul.epizy.com/collector_50p_coins_girl_guides.pdfIn PDF document text
    • http://zuwarevozaraxa.rf.gd/79704500012.pdfIn PDF document text
    • http://worubigux.epizy.com/cashew_nut_shelling_machine_design.pdfIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_b3f8e1f469114175a4a044c13a372d88.pdf?index=trueIn PDF document text
    • http://vadititemudifi.rf.gd/concussion_protocol_for_adults.pdfIn PDF document text
    • http://nozoxofepek.rf.gd/12998801032.pdfIn PDF document text
    • http://sevaguv.rf.gd/fefunenesijivixonitup.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_04d7f0572fa14fda9fc1ec3aa119bcc6.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_7cbff12ee60549e59d42390401792bb7.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 3368 bytes
SHA-256: 23450e29ffa6de749f5b39ee0ae6c5603990389015c7cefdb02a8ee0426fca2d
font_01_sfnt_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 5348 bytes
SHA-256: a8501397b82e3c07763a67b9fb787fcf36da77d705677ef9db3dc3de2c525e79
font_02_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 10200 bytes
SHA-256: 0a75d402eab8b796b3b2b9dcbea8f9cf6557ccf3e264128ac9a27ed05c0c7522