Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f87ecb7863c125e…

MALICIOUS

PDF

73.8 KB Created: 2021-03-16 19:03:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6e21da6834eaabea1770b4e8dba9564b SHA-1: 4afe449f3b286fde2b22528b8df619b2fd241f19 SHA-256: 0f87ecb7863c125e5002de82ec25cdebf7e38bb0bad92ef4314727000db936e9
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external URLs. No scripts were extracted, but the structure and heuristics point to a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/wix?keyword=superfighters+unblocked+games+66 PDF link annotation
    • https://cdn.sqhk.co/wejewenu/hejcM6x/lawezakolazapenupolal.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/74379836531sqpfk.pdfIn PDF document text
    • https://cdn.sqhk.co/kufedefivuvu/l1idwMI/260185951.pdfIn PDF document text
    • http://spainwow.pro/hp_beats_audio_software_windows_8._1kblh4.pdfIn PDF document text
    • http://summ-ita.space/myfinancelab_access_code_free_downloycvfj.pdfIn PDF document text
    • http://sodaapp.pro/ingersoll_rand_compressor_oil_types6h27.pdfIn PDF document text
    • http://card2card-perevod24.site/rolivewo8i7u1.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/oqyjhw5/tewelukukesilif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rupegofiminatef.epizy.com/minecraft_ps4_bedwars_server.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_f05942c229e144c98095a3e8725e0d1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/518df3ac-5545-41bf-8a3d-43ca1161da0c/tomilasoludirami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19deacc8-09ed-42b2-ada9-4d5e8ab3d5b3/bukadokokabesomu.pdfIn PDF document text
    • http://zuriromaruwo.epizy.com/suvepoludezaxim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9dee4f2-7a74-4133-be18-affd06dcc1a4/xoxejidolixorajemulimut.pdfIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_ef1c059b7d984ae88ace39265c6357b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25552046-a053-429b-9aa9-98ccebe1b892/56322300839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16650e7-f3fe-4639-a923-6003f8d11145/cuisinart_toaster_oven_broilers_chefs_convection_toaster_oven_tob-260n1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206302bc-8b8e-443c-b589-8941138e0c5d/can_you_keep_a_secret_rating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92dd3bd1-7aa4-4eb7-abaa-4814153a3348/dell_optiplex_9020_ultra_small_form_factor_dimensions.pdfIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_b502339130cc45369295a2651de795fc.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_15c11b56802242eb828bef0cfb2a5e9f.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_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 6032 bytes
SHA-256: d22bf018cc60e2cd68e8cef74c4979070b83512811a559ab0b7020cad9ac9159
font_01_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 10392 bytes
SHA-256: 63aa4a5fe1ee378a13ca1e8283d3b94f54286efec92e88fdb24c7cc82b8f0686