Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db80cb974e7f2f1…

MALICIOUS

PDF

78.7 KB Created: 2021-03-17 06:55:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd1e9afd3699d35c3d8fe29f1e91132c SHA-1: 32bad50c3c74a39a1d1a2c2904729f58a3dc5e10 SHA-256: 1db80cb974e7f2f13c803843eaad8ff8475728f406cbac6a4deb273bfedbf2c3
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://resalured.ru/strik?utm_term=ma+rmv+permit+study+guide
    • http://sewonmedix.ru/how_do_you_reset_a_samsung_refrigerator_with_twin_cooling5b4de.pdf
    • http://tryplafond.xyz/nomeliveju2quix.pdf
    • https://vunisanege.weebly.com/uploads/1/3/0/8/130813420/cd7cd00064e5.pdf
    • http://creamwalls.online/hard_reset_samsung_tab_ce0168dkh51.pdf
    • http://vifijes.22web.org/the_mayo_clinic_breast_cancer_book.pdf
    • http://tulumobutu.22web.org/73888990974.pdf
    • https://nabidojanafo.weebly.com/uploads/1/3/4/4/134455463/kinozofeminapek.pdf
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/97d439ef1d9.pdf
    • https://gebijodefilamoz.weebly.com/uploads/1/3/1/4/131406109/tojegat.pdf
    • http://summer-italy.fun/11148111316svaf7.pdf
    • https://pirizujimo.weebly.com/uploads/1/3/4/4/134454944/zenem.pdf
    • http://micrometerdigital.xyz/584766583861io78.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://febagilelefejen.epizy.com/dunkin_donuts_munchkin_nutrition_info.pdf
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_97490fe8b4f04bb9a749e94fdd5178df.pdf?index=true
    • https://965bd944-310b-4209-a71a-d16e45aaced4.filesusr.com/ugd/5f02e6_00c5da61f60e432fae6cc5822c520dd9.pdf?index=true
    • http://gepikadagutuv.epizy.com/94231178382.pdf
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_91f8d714b58b4e248ef0700dbcffb753.pdf?index=true
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_2cd49818cff34ae1a4305065ad7d9bc4.pdf?index=true
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_98ceee83bdf64a878d70c79004376645.pdf?index=true
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_3e86322e49c94e4796797371707a5846.pdf?index=true
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_a4ac70f452034f9fbe34ad8a5ce6ee58.pdf?index=true
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_fce5ceda88e3489d89f73d347472cf26.pdf?index=true
    • http://dejujerun.rf.gd/zumusonumibuxigiru.pdf
    • http://kefijirimo.rf.gd/luces_de_bohemia_analisis_escena_12.pdf
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_43c8eca453ef4944813fbdb972e01817.pdf?index=true
    • http://nozasilexezut.rf.gd/sea_animals_colouring.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f45c.bin
caa41f5dd64eb6f814942835f051aa34a62425bded311e52cd78ccdac0da30fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 5412 bytes
font_01_sfnt_off000106cd.bin
10bdb966d14b90bc4277d5ce27b9b5f7f2de49198a5a6108ade0db07cafe242e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 11076 bytes

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