Malicious PDF — malware analysis report

Static analysis result for SHA-256 2791d7b999dc3994…

MALICIOUS

PDF

80.7 KB Created: 2021-03-23 02:50:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9904a523ae9ebbbbc3b0932a838025cd SHA-1: 6d4f0bfe0e18a1e73e5f9ec97ecb6435231265d3 SHA-256: 2791d7b999dc3994cbf3377ecca941e5c4e044ad7f1f2d767e7df7a80eaa66b9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://botokaw.ru/wix?keyword=31.+battles+of+the+civil+war+crossword+puzzle+answers', appears to be a keyword-driven redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=31.+battles+of+the+civil+war+crossword+puzzle+answers PDF link annotation
    • https://jifosibupegexuv.weebly.com/uploads/1/3/4/6/134692258/nogen-xosusububi.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/desidratao_de_alcoois.pdfIn PDF document text
    • http://saduzemed.mypressonline.com/cathy_o_brien_book.pdfIn PDF document text
    • https://giduwopevaxotos.weebly.com/uploads/1/3/5/4/135401458/zagafor.pdfIn PDF document text
    • http://negedibomul.sportsontheweb.net/acls_review_made_incredibly_easy.pdfIn PDF document text
    • http://dirozigumifew.scienceontheweb.net/taxpayer_bill_of_rights.pdfIn PDF document text
    • http://everydayy.fun/lamborghini_gallardo_superleggera_2008_precioqcluc.pdfIn PDF document text
    • http://lovelyhouse.online/785165885613bjps.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_411a032ae64b4fe6a66f5e82eacb30ed.pdf?index=trueIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_0f49c94c8cc643ebbbded2f62395e4a3.pdf?index=trueIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_6dd98ac392c642f5a6e6441cbf4cac86.pdf?index=trueIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_3b14cebdbd94468dbc5482ef29be61e5.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_8e3b4e56df364c0098f6d251d9088930.pdf?index=trueIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_695de8a49c0f4db8b9b4596c0984c8c4.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_84399028c1a74568a5a73cb6ece48ed9.pdf?index=trueIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_667fea96395b4c1f903da5e64cdc3123.pdf?index=trueIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_74f1c72d12e145ad8cff1335912c5a7a.pdf?index=trueIn PDF document text
    • http://domuromu.atwebpages.com/the_bluest_eye_summary_and_analysis.pdfIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_542682fdca914df093c30b2903a588af.pdf?index=trueIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_501f10cf4d694cc89f2e8813bca1e522.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_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 5736 bytes
SHA-256: 501622eb435cd8906b7ba998949fb9912dbfa408c7c6deebea50670f39ba79fa
font_01_sfnt_off0001100c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 10768 bytes
SHA-256: fcd9c3731c71ad8498aa58592b2f26b2bed1daa7799b5612f783bd8db6e20820