Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c7a2ff759e8f35…

MALICIOUS

PDF

84.0 KB Created: 2021-04-10 21:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: eabf248ef581c44612ccdc6665b630d8 SHA-1: 660efb8adda62d84c559682a929653227879ae71 SHA-256: 25c7a2ff759e8f35e449cd7b9275aeaa949b35962891eccc24d1742671d600a0
186 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body is heavily obfuscated and contains metadata related to PDF generation tools, but no clear instructions or lures are discernible from the readable text. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ponafet.ru/strik?utm_term=who+makes+kobalt+portable+table+saw PDF link annotation
    • https://cdn.sqhk.co/xadakede/jabjdNY/guide_du_routard_israel_fnac.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/0K8iaid/fruit_toy_blast_game.pdfIn PDF document text
    • https://jumozapanase.weebly.com/uploads/1/3/6/0/136001057/9473367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_6064279981911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481510/normal_60276ba516df1.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/gagulepukubogegob.pdfIn PDF document text
    • https://nozirurabi.weebly.com/uploads/1/3/0/7/130738896/vizuzanakavitogev.pdfIn PDF document text
    • https://cdn.sqhk.co/salejejo/ijijbid/90952317792.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/ghhhije/wavamunesoxatururidubuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375704/normal_6008714230e98.pdfIn PDF document text
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/jetusim.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/RiiZTQH/thimbleweed_park_delores_balloon_animal.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/31557769108.pdfIn PDF document text
    • https://cdn.sqhk.co/vekokizijam/PBRjfge/snapper_fish_meaning_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/kerikone/P3P7ig0/win_10_theme_for_computer_launcher_2020_apk.pdfIn PDF document text
    • http://jexekiraj.sportsontheweb.net/relomam.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/h1OjjTX/vaganebu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mizetum.onlinewebshop.net/acupressure_points_for_constipation.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_c2fdfb94282a4790b0353926d2987d1a.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_9cf4309a6d024f2490fe534a5501f8f4.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_e387cad0cf05440487df187652a3e6ed.pdf?index=trueIn PDF document text
    • http://rixuroruwe.myartsonline.com/56983723204.pdfIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_b24dcfa0f4314315990a328568776e15.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_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 5368 bytes
SHA-256: 5ed2d6d6525fdaf04e3a019917129c9524a5e3598091fb84788fcf0a8f1d4e0f
font_01_sfnt_off00011703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11703 13472 bytes
SHA-256: 1ad72a2d2efc0463f2c96cf90c61a44b0196a4c63ea8f9cbb28e0e04f0b5f68b