Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4ad379d20bf384…

MALICIOUS

PDF

75.7 KB Created: 2021-03-20 22:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c43e503393be5d808190531b30f59599 SHA-1: 508c0a82f2556042e5e5dfbe25dfdc5e2f4c7b79 SHA-256: bc4ad379d20bf384d893953fab717949ca09072f71512877dd2ec210c4e2e106
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

Heuristics 5

  • 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 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/wix?keyword=effects+of+storms+on+beaches PDF link annotation
    • http://situvupumu.medianewsonline.com/zarozi.pdfIn PDF document text
    • http://zilitimo.getenjoyment.net/58362212722.pdfIn PDF document text
    • https://nusisudarebo.weebly.com/uploads/1/3/4/3/134349377/sivaba.pdfIn PDF document text
    • http://pusapev.scienceontheweb.net/jidoxewu.pdfIn PDF document text
    • http://retoxen.mypressonline.com/ship_captain_and_crew_dice_game_rules.pdfIn PDF document text
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/jajilakaweko_zurixasurel_tomokedufilafab.pdfIn PDF document text
    • http://zonuvak.medianewsonline.com/refopu.pdfIn PDF document text
    • https://xijafidul.weebly.com/uploads/1/3/2/3/132303061/2131217.pdfIn PDF document text
    • http://tulumiv.medianewsonline.com/pazadelasovepofoz.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/6d13c1df-f873-49b3-a12e-179405234e22/gardners_art_through_the_ages_a_concise_global_history_4th_edition.pdfIn PDF document text
    • https://b1394492-4877-47b1-8bf2-e962974baa99.filesusr.com/ugd/3e4b7a_ab1493dd20b9493897c5306a73036a40.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f49f3e0-46cc-4abb-b7ed-e1ed65e37661/97800370047.pdfIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_fa8ac0e052a1418bae0dc32104065b4e.pdf?index=trueIn PDF document text
    • http://likasuretaw.onlinewebshop.net/astm_a530_espaol.pdfIn PDF document text
    • https://1a413096-4115-453c-84a6-e19f3d0a1e7a.filesusr.com/ugd/4a2d03_bc5a8c0e446f49e6953598a3dbf1373f.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_326c09d873d94c2cb7f28bafab33186d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c128f02b-f543-426f-a205-c230ee852cef/trig_identities_problems_with_solutions.pdfIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/turtle_beach_elite_800_ps4_slim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84608e1a-fdb5-470d-9785-386ac346a853/tevixomir.pdfIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/30061505330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26a6415-a7e7-4b75-9639-0f934f893b56/50729624517.pdfIn PDF document text
    • http://guriseb.myartsonline.com/lexilamugegapu.pdfIn PDF document text
    • http://newemepakirid.myartsonline.com/dopure.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_020798ea01784bccb4b97cee78230412.pdf?index=trueIn PDF document text
    • http://xowobovu.myartsonline.com/zuvavevu.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_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 5188 bytes
SHA-256: bdaa20dc2f1b57e98f5930f9ac115ae0864c8fcc017698777bb65b05822b10ed
font_01_sfnt_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 11136 bytes
SHA-256: 459ad73192416828731b22767472bad962a547a065b1fc828782cb98a8b35e0a