Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ac43b7e5f73295…

MALICIOUS

PDF

76.2 KB Created: 2021-03-19 18:36:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c442520695a7dfd3540988382767c68d SHA-1: dfac78563f0dbfabf369c539f4f356b2643fcc27 SHA-256: b6ac43b7e5f73295ee4ab250982a859aa191ac07484809b5ea753741355218ae
126 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains multiple embedded URLs, including suspicious domains like zajinet.ru and nekretnine.site, which are likely used to redirect users to phishing or malware hosting sites. The PDF structure and embedded links suggest an attempt to exploit users through deceptive content, aligning with phishing and potential malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://zajinet.ru/award?keyword=curso+de+economia+ambiental+pdf PDF link annotation
    • http://nekretnine.site/dos_command_list_files_older_than_datexd7cq.pdfIn PDF document text
    • http://wisitens.online/gd_stash_crafting_guide7t799.pdfIn PDF document text
    • https://cdn.sqhk.co/zedazisem/xHpicgd/gokibepotufimowewixe.pdfIn PDF document text
    • http://sexedate69.site/63654670808hkeea.pdfIn PDF document text
    • http://fringigejy.site/4911058573983hq8.pdfIn PDF document text
    • https://cdn.sqhk.co/kotafuli/aicohh1/58515672381.pdfIn PDF document text
    • https://cdn.sqhk.co/lixozimiz/Wgciaia/murem.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/rovudemowikenusonado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/simujix/71541731939.pdfIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_6e72e55012ed45338a8c37c3a4e1d6c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/how_to_describe_tree_at_night_lotion.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/42779758896.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/12375177366.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/60980422519.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_d8fe3cbbfc92405384d6fd66872448fc.pdf?index=trueIn PDF document text
    • http://niwurekatexo.atwebpages.com/excel_vba_message_box_syntax.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/57606997119.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_4d332b39952743a1b749a38796bb8d75.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_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 5344 bytes
SHA-256: b16528be9d3833359d705e1141a54fb08a7b3c0d3b3327adaa1d4521d82c2a05
font_01_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 12796 bytes
SHA-256: 0f72ad2f00c8d8a3324c28f41b6d38c58e8670c1d67e7327aa36a7df0927ae20

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