Malicious PDF — malware analysis report

Static analysis result for SHA-256 f619dea6135aae17…

MALICIOUS

PDF

75.5 KB Created: 2021-03-14 09:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e755d4e37436a4a5b0aff48f74af2837 SHA-1: 2e0828e6124857b1a5cba1e7c47ca427b321ed94 SHA-256: f619dea6135aae179da5049b8a59761751435dfdff145c2c7a0b206d859c5c76
186 Risk Score

Malware Insights

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

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 0.9996

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://soxebez.ru/strik?utm_term=bach+cello+suite+1+guitar+tab+in+g PDF link annotation
    • http://chempion.coffee/old_man_s_journey_apk2e2qe.pdfIn PDF document text
    • http://razvivatel.blog/canon_eos_5d_mk_iv_manual3bts0.pdfIn PDF document text
    • http://itawegan.space/chemistry_balancing_equations_worksheet_answer_key6zqqz.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/duzakaxuxanaxi.pdfIn PDF document text
    • http://getsol.xyz/583549259307sky5.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/83826091573xod66.pdfIn PDF document text
    • http://ig-soft-team.com/jakks_pacific_night_vision_binocularssprcj.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/wurikibumogaw_lupuvipa.pdfIn PDF document text
    • https://nifixivenugoku.weebly.com/uploads/1/3/1/8/131856212/de33f0818.pdfIn PDF document text
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/lasol_tuzerib_labiwetowatoka.pdfIn PDF document text
    • http://trokot-newshop.online/86495436159odjtf.pdfIn PDF document text
    • http://septiki-rf.website/2005_cadillac_cts_engine_3.6_l_v6rdwv9.pdfIn PDF document text
    • https://mexobuvuxe.weebly.com/uploads/1/3/4/3/134369937/nakatudo_dadezuju_savunem_gurisapu.pdfIn PDF document text
    • http://blubadgehelp.net/mathematical_statistics_with_applications_solutions_chapter_21nnlz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_44959e89084e495089e792533cf24523.pdf?index=trueIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_762528c3a238495ca41b84f0df148288.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d96ad044-2b54-4cce-ae80-75c70c3796d0/62441137993.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_5b022748a234460c8326db8b80e12787.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3538f2e3-d496-4ca0-a974-fb389443923b/blackberry_smoke_no_way_back_to_eden_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e10f76-fa2c-44f6-b4d2-459db3b96df9/27954525492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/917fba4c-b021-4d10-9c0c-5397546214a5/nezugosewamolujabawo.pdfIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_f443d3f78ec84b708ee5b1548bd58e6e.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_off0000e885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 5300 bytes
SHA-256: d777d823127a037a5efb3e73a5e1bd3e53a594f002bce8b428ee0e3a683b689c
font_01_sfnt_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 11084 bytes
SHA-256: 54db0c3106214ef6ecc9a10bf1529c436d1aff71353cd191a699f55fc66a0ccf