Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ec364e1ce8f054…

MALICIOUS

PDF

126.4 KB Created: 2021-03-01 05:35:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 058d5b4a0f4506da73402b7475f9c529 SHA-1: 4f19ace8ac2bb4f2468f43379d8e7be1093e9c77 SHA-256: b1ec364e1ce8f054cd113ec3fe4543b659e3df4173abaca10a40ea61e469ded8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many hosted on disposable domains or link farms, indicating a likely phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/award?keyword=maus+volume+2+summary PDF link annotation
    • https://cdn.sqhk.co/vujenibolo/bibjcGz/uncertainty_reduction_theory_axioms.pdfIn PDF document text
    • https://sukanoxe.weebly.com/uploads/1/3/1/4/131453950/8b9f6ac70a.pdfIn PDF document text
    • https://fegopamaxu.weebly.com/uploads/1/3/4/8/134896151/biwobutejebubigonufa.pdfIn PDF document text
    • https://cdn.sqhk.co/fivodewile/bWhhgiN/adventure_escape_mysteries_picture_perfect_chapter_1.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/boss_gt_1000_price_in_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/jja7Thg/gunner_fps_shooter_game_download.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/honda_harmony_1011_riding_mower_for_sale.pdfIn PDF document text
    • http://mutinujevax.22web.org/network_access_control_system_management_software.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/idjcibT/big_baby_tape_acab.pdfIn PDF document text
    • https://cdn.sqhk.co/rujuwawuju/ZmhbVuH/thrifty_car_rental_lax_airport_phone_number.pdfIn PDF document text
    • https://pumurepuwalor.weebly.com/uploads/1/3/5/9/135978845/697c6402070b.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/30962296887.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/hjlgcij/idle_champions_forgotten_realms_codes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lejopuluke.rf.gd/ruxirezodobare.pdfIn PDF document text
    • http://pewusufep.epizy.com/auctionator_classic_wow_guide.pdfIn PDF document text
    • http://fazajupozapufo.rf.gd/john_lewis_bed_sheets_grey.pdfIn PDF document text
    • http://suxikikafib.epizy.com/doboxotojofugoweroz.pdfIn PDF document text
    • http://bejutamukedus.epizy.com/free_cbt_worksheets_for_anger.pdfIn PDF document text
    • http://surozot.rf.gd/hess_baldpate_platform.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/vugugepajebekakop.pdfIn PDF document text
    • http://ronogaso.rf.gd/zadojokafemozu.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_off0001b373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B373 5132 bytes
SHA-256: bf37edaeed496ac42483dc778463ddacf542d1e3a5c8c855101ac7d85cd15ab6
font_01_sfnt_off0001c4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4E7 11352 bytes
SHA-256: fed15d819e9d34c0dc67f3a77b5f0c0f0719bea7465c74c1b50937e67a365842

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