Malicious PDF — malware analysis report

Static analysis result for SHA-256 8407cf9a812a4605…

MALICIOUS

PDF

73.8 KB Created: 2021-03-15 12:00:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 38fc8c54994c30b1ab228b8be358fdf9 SHA-1: 1a28bfdbc5785fd46dc5fd1066419ba3ec44dc26 SHA-256: 8407cf9a812a4605a554e4d0f25f52e066f9b9b422ab490499c44f4af42345f0
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 0.9960

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=wahl+clipper+gift+set+boots PDF link annotation
    • http://reduslimitaly-official.site/balancing_equations_challenge_worksheet_answer_keypx3zg.pdfIn PDF document text
    • https://wabomojufodeze.weebly.com/uploads/1/3/3/9/133999178/vejekenufovol.pdfIn PDF document text
    • https://jikudirag.weebly.com/uploads/1/3/4/0/134040407/xaxalujegorilegeku.pdfIn PDF document text
    • http://oneitshop.pro/photoshop_book_in_telugu_free_download4zbkv.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/iekgn5O/narcos_cartel_wars_game_cheats.pdfIn PDF document text
    • http://usesucre.pro/programming_chamberlain_clicker_universal_remote_control55tpb.pdfIn PDF document text
    • https://cdn.sqhk.co/vemonososepa/ROyEwhV/hot_springs_story_apk_2._3._9_download.pdfIn PDF document text
    • https://bipuwuvi.weebly.com/uploads/1/3/0/7/130776795/tetewujatemu.pdfIn PDF document text
    • http://barbanapoli.moscow/74472187379hssk9.pdfIn PDF document text
    • http://nakrutkavk.site/16914450384p88a0.pdfIn PDF document text
    • https://gededojoseg.weebly.com/uploads/1/3/4/3/134341448/5789903.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/jhcegeg/72401649627.pdfIn PDF document text
    • https://cdn.sqhk.co/rudugebakivo/hicPQMq/nonovebozijisiron.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/pawaripumoxubelev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d71b50d-c0a1-47fe-ab44-e1893a381bb5/55148726015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80be925c-88af-4a9b-bb20-c20e2ee18ff8/goxowusabexat.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/bevokasunime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4fbf6e-d9d4-477c-8a8f-f75f01de3333/62496353364.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_bb42f1b993894321b4635ba133036105.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xurixado/critical_ops_hack_apk_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1968f768-f7d2-4c85-a0d5-9725354d5522/clark_electric_forklift_error_code_list.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/avast_secureline_crack_apk.pdfIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_78fc96603559420683c19f1008037dbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobito/43812316990.pdfIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_585ad574c980401b8ea5025144b04024.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5477c0c-86ef-483e-a127-f9af7b36a959/hoover_windtunnel_3_channels_of_suction_not_working.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_off0000e161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 5432 bytes
SHA-256: 38496d852ecad34726ceb90c3e1f2b0f74079304e55f1107570f757724465c1e
font_01_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 11172 bytes
SHA-256: 6fcfa476f30edff753f59401e9b1f7dfb858b1e043b5aaa9094213caed37d34a