Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf759801408bbb6…

MALICIOUS

PDF

83.9 KB Created: 2021-04-03 12:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 53a1c92091a6490df7c98ae89e914739 SHA-1: 508cc44a88114706444ec2e2aee5dbcbe42091e3 SHA-256: bcf759801408bbb6a5ec9c55144c259841206fceeda14015681b0a994d791f4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9957

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://golowaki.ru/123?utm_term=knec+business+plan+samples+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459054/normal_5ff027ec8919e.pdfIn PDF document text
    • http://astrology-personal.online/zebco_2020_repairfwojx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479237/normal_60483a5cea77f.pdfIn PDF document text
    • http://edayafar.xyz/31904174502mw6zm.pdfIn PDF document text
    • http://vumegebopim.iblogger.org/ficciones_borges_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483349/normal_6014bb3c72949.pdfIn PDF document text
    • http://atomyimperial.ru/teachers_college_press_return_policyxkn3s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_600bd047aeb14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409243/normal_60249ca7c4836.pdfIn PDF document text
    • http://podarokinsta.site/analysis_of_the_boy_in_the_striped_pajamas_bookf22la.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_6028e8825af92.pdfIn PDF document text
    • http://dopezonuj.iblogger.org/bifurcation_of_ap_in_telugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413967/normal_5fd918b9727b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403131/normal_5ffd7254517a5.pdfIn PDF document text
    • http://idealica-uficiale.website/how_to_program_dish_network_remote_to_control_vizio_tv6z11o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7fd4abad-31f8-4c52-ae8e-93d0cc7f2af2.filesusr.com/ugd/910e70_c10b4203979740248f0b226bc4d64025.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a53cc1e4-44b4-45b2-af5d-ebeb79dbadfc/tevixugosaxizanumonopixa.pdfIn PDF document text
    • http://dofagubixipo.rf.gd/dubai_expo_2020_logo.pdfIn PDF document text
    • http://wuvasof.epizy.com/malaiyuru_nattamai_ringtone.pdfIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_32323723b2c8418cafc13f64d202bc15.pdf?index=trueIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_ab91f930170d4c73ae6a0c5b16d45cc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42580544-fe1d-4306-899b-287eaba70399/vonexexobekepazurew.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_8a09cb25ef50466ebd1e1273b14e7e2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5184d47-88e4-4da0-857a-5391d36c9b38/89558320357.pdfIn PDF document text
    • http://dikumetuvo.epizy.com/46660348182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d24f724f-664c-469b-83b4-ae1b931bd7a1/lg_g_pad_7.0_lte_hard_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fadfa7e-ab98-4ccf-b7ed-0950565aa5d0/what_is_the_synonym_of_worthless_fellow.pdfIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_47ec9eee47bb402cbc1d208cace4417e.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_off00010ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 5312 bytes
SHA-256: 60667de9ba6502fc71c6fe1a01574d820df6073bd8f21b6a83ea720ae1be13be
font_01_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 10516 bytes
SHA-256: 4f4763c4d14ffe050226c86ce39b1a4bff47a8238703c37fd957b725b5cdd524