Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9ef8d1ac49b5b5…

MALICIOUS

PDF

74.8 KB Created: 2021-03-04 09:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 26bfde5c0ce890e6f049e4dc7e82f9c4 SHA-1: 463a13ba65c00b6ad66abf11ff730f05166fe6db SHA-256: ac9ef8d1ac49b5b5cda8065850092ffa9b322a191843eabaa4107df5ef9b15b7
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic strongly indicate the document's purpose is to redirect users to potentially harmful websites.

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://nipisod.ru/strik?utm_term=gene+keys+book+richard+rudd PDF link annotation
    • https://zazanopub.weebly.com/uploads/1/3/2/7/132712119/mewenofigexusupo.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/hdig3hc/94499456219.pdfIn PDF document text
    • https://cdn.sqhk.co/ramidazumiko/qgLhhhi/xizunagedisorozapoxoke.pdfIn PDF document text
    • http://xivetaf.22web.org/i.t_technician_jobs_in_ghana_2019.pdfIn PDF document text
    • https://rizafosukozesal.weebly.com/uploads/1/3/5/3/135346652/a7fc40d7e0777.pdfIn PDF document text
    • http://jigunemav.22web.org/google_assistant_for_android_lollipop.pdfIn PDF document text
    • https://cdn.sqhk.co/jusulikipe/ihr6jjb/forge_of_empires_lord_s_manor.pdfIn PDF document text
    • https://dodapufil.weebly.com/uploads/1/3/0/8/130813701/sigarulid_rirupidawep.pdfIn PDF document text
    • https://lepefolavexar.weebly.com/uploads/1/3/0/8/130874674/617cd.pdfIn PDF document text
    • https://guvijubeb.weebly.com/uploads/1/3/5/3/135318684/f0af52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nepopujadulipid.epizy.com/angles_in_polygons_worksheet_table.pdfIn PDF document text
    • http://jikusipuxojapu.epizy.com/46739413755.pdfIn PDF document text
    • http://rolozaj.epizy.com/vagizeraseruwogar.pdfIn PDF document text
    • http://siwodonodefofo.epizy.com/kundhi_muchh_pamma_dumewal_video_song.pdfIn PDF document text
    • http://lexojowal.epizy.com/rifokigazedate.pdfIn 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_off0000e919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE919 5332 bytes
SHA-256: 36ae87e8bd7dbe13bc8fa2d88e500784b1cf27619c08f73b5d8cabd7bc179f28
font_01_sfnt_off0000fb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 10208 bytes
SHA-256: df2b397733d085f88b1978d8a409532aaa94f7dcc6d18101646171dc5841849f

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