Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4b73870f25709b…

MALICIOUS

PDF

88.0 KB Created: 2021-03-29 23:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 330601360b26d17776aa5871dbbff248 SHA-1: cdbbcac23c1d818ed64273ffb8aff702aaf80f8c SHA-256: da4b73870f25709bc217283497cb556dd183f231c42e7be87659811095a461e2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous external URLs, with one notable URL being https://golowaki.ru/123?utm_term=amplitude+modulation+chapter+pdf. The presence of a link farm suggests an attempt to direct users to potentially malicious websites for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/123?utm_term=amplitude+modulation+chapter+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389097/normal_601150f3ce263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381083/normal_6037948a3e79b.pdfIn PDF document text
    • http://jefozogez.66ghz.com/great_benefits_of_reading.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/90075204632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_5fdc47de0da2c.pdfIn PDF document text
    • http://rulajamizap.getenjoyment.net/laxol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496225/normal_6055ee75a8b83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/85aa1776-b582-4a4b-8aef-2a717ab073f8/full_movie_the_pact_2014.pdfIn PDF document text
    • http://mogixos.atwebpages.com/scouts_badges_and_awards_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b47d6975-d99d-4641-8272-d3d89664ce63/heat_exchanger_design_handbook_beaton.pdfIn PDF document text
    • http://zilajib.epizy.com/autumn_leaves_easy_piano_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03edb79b-906f-4dab-bb30-ad5b34fd76f6/decolonising_the_mind_google_books.pdfIn PDF document text
    • http://renumobopus.rf.gd/rozubumezonujaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/315d2328-de28-46c6-8133-f893867be18d/peximaxipovoxagisorenalox.pdfIn PDF document text
    • http://dugubokig.rf.gd/what_does_a_machine_learning_engineer_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948829c1-2fca-4f7b-bc81-a1ab89c8f135/ferrari_812_superfast_top_speed_run.pdfIn PDF document text
    • http://vegusofeta.rf.gd/widopadeza.pdfIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_fa364df5532542db89d874404b32676d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22088f37-ae98-4816-9d22-57e90cb56c49/wendys_menu_nutrition_carbs.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_de03b79cf48b4ea6ab4b77940cf545a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4028e48-47ab-4ed8-a1b8-f1157a6025b0/how_to_find_the_volume_of_a_cone_in_terms_of_pi.pdfIn PDF document text
    • http://bitujiduruv.myartsonline.com/27668606260.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 5088 bytes
SHA-256: 3bef249f0bd978e8dfa1fa9109e2a3ccc7950ebe286627527f9878b3d36c72d5
font_01_sfnt_off00010163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10163 13016 bytes
SHA-256: facca887c63817357dd5b5f436916e1b3439c0896678d4821ee7bcbfdf810734
font_02_sfnt_off00012e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3B 16260 bytes
SHA-256: 52ef0d656bce74ca58b2288f3efd32a0fafdb564d90fbe57ea174b7618b7ed14
font_03_sfnt_off000143d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D2 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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