Malicious PDF — malware analysis report

Static analysis result for SHA-256 d237686f0fb466c3…

MALICIOUS

PDF

87.8 KB Created: 2021-04-06 18:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ab7b111aeb7fd12611c8808b1e3068ee SHA-1: 35558cec9361dd2f83ca0bc01a59abcdc7e60c3a SHA-256: d237686f0fb466c3a409cd520e1e0756be7b31e1c0fd9e2ab71e1bc67ce1c9b4
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 0.9990

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://fokemale.ru/strik?utm_term=young+living+essential+oil+recipe+book PDF link annotation
    • https://xulegavumorojok.weebly.com/uploads/1/3/0/8/130813780/basaxigerutapekami.pdfIn PDF document text
    • http://money-team.site/9163359486idv9e.pdfIn PDF document text
    • https://nekamefirojes.weebly.com/uploads/1/3/0/7/130739169/wisoraxaminirud.pdfIn PDF document text
    • https://kikizesojumare.weebly.com/uploads/1/3/4/7/134718780/woxupivemep.pdfIn PDF document text
    • http://all-system7.xyz/it_positions_salary_rangesbrg5t.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/juverarabizifasakawofesa3j96d.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/the_social_contract_definition_world_history6y0j5.pdfIn PDF document text
    • http://devuweza.scienceontheweb.net/standard_of_asean_herbal_medicine.pdfIn PDF document text
    • http://uaregroup.com/2013_dodge_charger_engine_5.7_l_v8_for_saleaku9h.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/honda_eu2000i_weight.pdfIn PDF document text
    • https://cdn.sqhk.co/laloropaki/Zihgghb/diwebotadoparonufemapap.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/2PifLij/free_dating_apps_for_seniors.pdfIn PDF document text
    • https://vegiranelikir.weebly.com/uploads/1/3/4/3/134399044/mabazivo_renuwir_regomewosalix.pdfIn PDF document text
    • https://juguzitusiketi.weebly.com/uploads/1/3/4/3/134372303/rejuz_reneduriv_labezat.pdfIn PDF document text
    • https://cdn.sqhk.co/xomakonezema/foXWq0Y/62497362581.pdfIn PDF document text
    • https://nepubodi.weebly.com/uploads/1/3/4/6/134610278/5160785.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/RjcZicn/download_game_beat_the_boss_3_mod_apk.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/biophysical_society_meeting_2020_program.pdfIn PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/zumedinenupinid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ledufowi.myartsonline.com/92274749638.pdfIn PDF document text
    • http://pasofotamuteper.atwebpages.com/92871211126.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/73813958587.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/88951196191.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACB 5208 bytes
SHA-256: 094b2acce38f685c56fcc399e8d64f7a853dfa8909c79630ae425e40ac7946ed
font_01_sfnt_off00011c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C98 11452 bytes
SHA-256: bf1616e678b5a98c1394dea6a0ada2cea6c5228920cfd798ab8bbadb29a0e9af
font_02_sfnt_off000143b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3