Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cd211be618a242…

MALICIOUS

PDF

74.6 KB Created: 2021-03-21 08:27:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 79e0da3ebd26857192dd8722957acd34 SHA-1: c5a3e8e1677eb8bcb06bd7b39de6d43dee0cacd2 SHA-256: 20cd211be618a2423027a5fbb5ef6b3883e9cb8f28ddb4ff12cd8c281417866c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the presence of numerous external URLs points towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://vilenefex.ru/123?utm_term=spring+boot+controller+test+resttemplate PDF link annotation
    • http://wdd13.ru/best_books_to_learn_austrian_economicsy6zdu.pdfIn PDF document text
    • https://nibivesulekot.weebly.com/uploads/1/3/4/0/134017222/sikazo.pdfIn PDF document text
    • http://flowerport.shop/minn_kota_ulterra_motor_error_will_not_deployz9jjt.pdfIn PDF document text
    • http://djami.ru/81770198851ws74t.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/lhbB6ao/bodipuvit.pdfIn PDF document text
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/c2c1247a1d8eb70.pdfIn PDF document text
    • http://studyweb.site/second_type_conditional_clause_exercisesom5e0.pdfIn PDF document text
    • https://cdn.sqhk.co/sepexapubu/GNibghe/chelsea_fc_fixtures.pdfIn PDF document text
    • http://devlp.design/1619821455qcm7q.pdfIn PDF document text
    • http://nely.xyz/bemaduxuposo58gto.pdfIn PDF document text
    • http://theandyhong.com/19147779398dstpu.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/Riit8GO/pitbull_redboy_rascal.pdfIn PDF document text
    • https://desaboros.weebly.com/uploads/1/3/5/4/135400021/besobire-luvotov-vutix-difibegedoxipiw.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/jfjcPjt/snapchat_filter_for_dogs_2019.pdfIn PDF document text
    • http://olx-delivery.cc/digraph_worksheets_free0qm6x.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/hdii1pO/62486607190.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/hJlhGLW/sheltered_at_sea_crossword_puzzle_clue.pdfIn PDF document text
    • https://cdn.sqhk.co/rumomezojeku/9ZMVZ4d/adventure_mini_golfe_park_albufeira_portugal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 5496 bytes
SHA-256: 53d4e3f204753c61a17d4d9122503260d3caee3eac77c2f183f0b0c438bdfcda
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 11896 bytes
SHA-256: 1f476010c7edabb1034db086d9ef4391657de8b0e6c94b81602e001fb5fdbf45

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