Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6cf505992ff02b…

MALICIOUS

PDF

85.3 KB Created: 2021-04-26 02:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: bc91a8b0be4c2250e60ada3631fa9761 SHA-1: 802ad14ede5fe09813f2c9a8e72e1402c0858ad6 SHA-256: ab6cf505992ff02b6ce20ae7af401e7a3ef94a6d95e9ce3cc476c4ac6ad0a174
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('nipisod.ru' and 'janorewaxeno.mygamesonline.org') that are likely used to host phishing content or distribute further malware. The PDF structure and embedded content suggest it's part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=cultural+identity+and+cinematic+representation+stuart+hall PDF link annotation
    • http://janorewaxeno.mygamesonline.org/modern_world_history_textbook_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/hb6icje/padasefarasul.pdfIn PDF document text
    • https://vofitikasu.weebly.com/uploads/1/3/1/8/131871658/rawesoralategu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454051/normal_6034d204176e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_603a7e7868d57.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/xgejazF/88584962302.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369768/normal_5fd077c9ee79f.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/g4DSwjy/run_dino_run_no_internet.pdfIn PDF document text
    • https://wixuzezokanozav.weebly.com/uploads/1/3/4/6/134663812/2380dac460f7e.pdfIn PDF document text
    • http://govuled.mywebcommunity.org/18302155919.pdfIn PDF document text
    • https://cdn.sqhk.co/faxotuxoro/hjcXXje/number_noun_worksheet_for_class_6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454052/normal_606227fa4ab9a.pdfIn PDF document text
    • https://cdn.sqhk.co/womafafowix/iiQjj75/53217366628.pdfIn PDF document text
    • https://sapefita.weebly.com/uploads/1/3/0/7/130776655/mobitutivugow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_c3c405a19e2b485b8f65783a90b26c9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e7d6bb-cdca-4a6d-be71-16a173cb320b/survival_games_pc_multiplayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de1f247-f08b-4d51-bf81-5721ec8e18bc/44952582270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4243243a-0398-4e27-915b-74121e5b7e27/96855476213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a91466-8ebe-4dc0-ac46-d84572bd3ff0/honeywell_quietset_fan_white.pdfIn PDF document text
    • http://pezamax.myartsonline.com/93493664283.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_6bebe7915cb74154ad7d2c3d4716da43.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff17f907-236c-4f86-aaae-137df9a72e91/the_fabric_of_the_cosmos_brian_greene.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/99604512096.pdfIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_e4572f4e227d467b8b05c273921d2603.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_off00010d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 5320 bytes
SHA-256: 21becd9f48934c331e829ca6cd0e6cdcb455fd4377565f4c0960cea85e81de6c
font_01_sfnt_off00011f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F14 11840 bytes
SHA-256: 8d0802ca2e9e13fb0eb516cf0f6657498b0711320fa5ea3e1f9e28af6ae36a9f