Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c13da18466b0e35…

MALICIOUS

PDF

74.4 KB Created: 2021-06-05 15:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2d8d79f48c1caaaffb75ec3792f6d9df SHA-1: d6bd73ee5fafb135ea171552ba8a656511139047 SHA-256: 8c13da18466b0e350357e8453b49cf1a096ceeb84d6205f814548ada5f7f2c7e
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URIs, many pointing to link farms and disposable hosting, designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to contain metadata related to its generation, but no direct instructions or lures are discernible from the readable portions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://laborke.ru/pbw?utm_term=what+is+the+difference+between+homologous+and+analogous+structures+quizlet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380522/normal_6058d6ea954ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5fd34d688e5b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499299/normal_5fe9cac8e8530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470698/normal_6055fbfd46a9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414701/normal_5fef78bbb606e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465128/normal_60021f1410c59.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/61055685-ede3-44d5-a8fd-170072220f72/que_es_la_ingenieria_inversa_del_software.pdfIn PDF document text
    • http://wefolevemud.pbworks.com/w/file/fetch/144475299/what_is_artificial_intelligence_in_ai.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/debixowukarivesila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a04eef-8365-4dfa-9b7a-2c37ce4781e9/mukilisejuzitupojukiduxo.pdfIn PDF document text
    • http://famukaser.pbworks.com/w/file/fetch/144583188/destination_a2_grammar_and_vocabulary.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/f/tasilisotetovafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b62512f2-7bdd-415f-ac49-20b8006d7f82/what_does_community_relations_mean_to_yourself.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b156d13-f139-41ef-bfed-26bf8efdfc50/43014181489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c2c992-4d4b-47c3-b99c-6b218ca3f794/8887452369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d147654-91a0-4519-8cc0-3f31d59b3cb9/livogabapadavokiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b983d29c-e757-4ec5-aa8e-95dfdc7ad4b6/dumoxebukezef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31bf662a-1dff-42d4-a1a9-f17cad4774f9/17810306822.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144649683/how_can_i_scan_my_lottery_ticket.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144636372/disney_store_frozen_2_dvd_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b88e462-679e-41a7-a899-acae60afe5b5/yahoo_horoscope_cancer_2015_zodiac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ab7f05-cced-4896-b475-227c89823e88/luxikukagexufaxenoweno.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_off0000e44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 5856 bytes
SHA-256: 121fd1c0583036c456de643d6856ede955563f765b6119723a311e8018c7ade6
font_01_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 10288 bytes
SHA-256: adde527bc49a46c166872f0d039b662581ed5c7f0d9ea4691e19e264610e8d30