Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8819c7411df3f1…

MALICIOUS

PDF

76.5 KB Created: 2021-04-11 16:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 91fa147032fbc2602999d29f49858100 SHA-1: d986790b031e2a924d88169e694cc7ea4175a19e SHA-256: 0e8819c7411df3f1f837aa545f20dd7293edd3761f34696595d982797bddceda
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 0.9993

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://zajinet.ru/strik?utm_term=lines+of+symmetry+worksheet+geometry+answer+key PDF link annotation
    • http://dororuminaxa.mywebcommunity.org/bpsk_adalah.pdfIn PDF document text
    • http://suvonenexazu.mywebcommunity.org/spine_strengthening_exercises.pdfIn PDF document text
    • http://armlur.space/248810940708oysf.pdfIn PDF document text
    • http://tublitalia.fun/she27s_the_man_full_movie_123moviesm05ac.pdfIn PDF document text
    • https://nexolibevi.weebly.com/uploads/1/3/4/4/134463206/3634185.pdfIn PDF document text
    • http://dombitarf.ru/radimitepesoxizatuvegifbomkn.pdfIn PDF document text
    • https://woxoxuwavi.weebly.com/uploads/1/3/4/6/134689382/vimekinora.pdfIn PDF document text
    • https://gofupadosu.weebly.com/uploads/1/3/4/8/134853885/fudaboxit_lupolonesed.pdfIn PDF document text
    • http://pycnidwzxc.info/wevizuguserowikabeselumvsc9l.pdfIn PDF document text
    • http://boothattendant.com/94899461973wk7tw.pdfIn PDF document text
    • https://bipovubukixepev.weebly.com/uploads/1/3/2/7/132740720/c21123538902dae.pdfIn PDF document text
    • http://pobadabodoz.scienceontheweb.net/26582717210.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/926aeb66-5da4-4bb1-b3a0-2bb4480415fe/semuwimetugoku.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/fibrosis_adalah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/477c7cfb-0ab3-458f-ba8b-01148131cc96/linir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c77c323-935b-41f7-b5e9-01a169841be6/27837349407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b490fe2e-5bbf-4d02-bf05-e26f9c789841/how_many_scoops_of_dunkin_donuts_coffee_for_12_cups.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/770fd1b9-b029-407c-8439-a5a347247099/how_can_i_tell_how_old_my_whirlpool_water_heater_is.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0d56eae-c8cc-4000-8f81-8863d61006a3/kazofuvamulosinotefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a8af207-a131-4f23-8b65-f07054e2ec16/tazuvesexopalivuruna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f31b168-ce79-46d7-ae8a-e1a19df74750/42096565260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7fb4da6-3493-456d-8422-787910946135/50740448082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d86ced-18eb-478d-90f2-7b7d78b78968/netoxamolugupuzova.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_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 5348 bytes
SHA-256: 02be6b93d384bde3cf5831fbbd09168790be81b2b729f1283fa1d874d20363af
font_01_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 10284 bytes
SHA-256: 63c14fed5aa4bd77eb82e30315ec29e6a41e3973d8214f94e4a2c5a4652c8d83