Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d98dbc9fe6887c…

MALICIOUS

PDF

69.5 KB Created: 2021-03-11 05:48:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 992e0642d307c60cc77b24263649fca8 SHA-1: cee6b0e4bf34b529407e2e676bcd982cf3402c11 SHA-256: d4d98dbc9fe6887c6dbe68cf8f47549fb33f92f0ff447421a45224bd3b095aab
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure, likely part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/award?keyword=automotive+technician+certification+test+preparation+manual+4th+edition+pdf PDF link annotation
    • http://bitawulam.iblogger.org/what_does_it_mean_to_be_a_representative_democracy.pdfIn PDF document text
    • http://slimerecipe.org/real_estate_settlement_statement_template4pk4a.pdfIn PDF document text
    • http://xenuven.22web.org/busy_accounting_software_learn.pdfIn PDF document text
    • http://xasedogamif.mypressonline.com/20742889053.pdfIn PDF document text
    • http://ralugugifoxatir.scienceontheweb.net/ikea_kitchen_catalogue_2020.pdfIn PDF document text
    • http://sevastopol.sale/191098947347tos0.pdfIn PDF document text
    • http://hugertely.xyz/71814906975bnx4w.pdfIn PDF document text
    • http://on-arenas.com/kuruxagisolise6eum7.pdfIn PDF document text
    • http://halfraire.xyz/nudupejedix0168.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_1693b641202648e3978f4d21b19b6014.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/cute_baby_pic_for_dp.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_068c39541a8745b9a9ecaca93f0a669f.pdf?index=trueIn PDF document text
    • http://gevosumol.epizy.com/didipusepawuzovib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95395369-fff7-4255-b294-92a993f6b2ec/gonidomenotogonap.pdfIn PDF document text
    • http://xamijofut.rf.gd/vazid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f16e885-c85f-4ea9-8c96-5644294175ff/staples_canada_shredder_bags.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44ba355-661c-4e25-810a-a261c3c1d512/speed_queen_gas_dryer_prices.pdfIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_7c81dd0719f948a1978a5bc327201b8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3518909f-b989-4db1-aee2-7c4a08a99cf9/hampton_bay_fan_remote_control_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/pavoburozirutajidow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57c037ee-e9b3-4b98-9459-fd8c1986c50a/pyxis_medstation_4000_2-drawer_main_weight.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_160830a8a95d46ea9a37aa4b6f2faa7e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5F 5532 bytes
SHA-256: 9641b77c278dca5599f7f55d77ba933030f7e58baf25c48de5f4763b0a95c3f8
font_01_sfnt_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 10428 bytes
SHA-256: 11192de6fe417b2a477148a01f87d2398f18a8ca9e285c72ac938a05fd71350e

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