Malicious PDF — malware analysis report

Static analysis result for SHA-256 91debf51b530b2f2…

MALICIOUS

PDF

73.3 KB Created: 2021-02-24 00:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 13ca656e13582f74ba23b57dcf8194cc SHA-1: ae010aea8ceefa515cad8b911dd2e859aeea1e7b SHA-256: 91debf51b530b2f2cd1726474926c9fd625e4baf465c6374ea168cabd0a1407f
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or SEO spamming operation. The presence of external URIs and a high number of distinct hosts with single links per host further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or content manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=best+no+logos+clothing PDF link annotation
    • http://ryukzak.digital/25097874191jzn81.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/P0AjbFK/nubogiwafepelija.pdfIn PDF document text
    • http://heleogose.online/web_banner_mockup_psd_freehicgg.pdfIn PDF document text
    • https://vopisozojozesa.weebly.com/uploads/1/3/1/4/131407388/filujunanigubofi.pdfIn PDF document text
    • http://universe1.space/final_commissioning_report_template3w4oj.pdfIn PDF document text
    • http://nonretloli.site/etfe_front_sheetgn5ya.pdfIn PDF document text
    • http://medicalpracticementor.com/40864178237mupll.pdfIn PDF document text
    • http://matroskin.space/basic_building_componentssarqf.pdfIn PDF document text
    • http://naturebiolog.fun/zulizisprnkv.pdfIn PDF document text
    • http://complerbnp.com/523586760098nmmo.pdfIn PDF document text
    • http://italysummer.fun/avg_antivirus_free_full_setupxdm4d.pdfIn PDF document text
    • https://kozivusetusi.weebly.com/uploads/1/3/4/2/134234967/7166364.pdfIn PDF document text
    • http://blog-millionaire.buzz/bridge_wallpaper_hd8xvko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fugewep.rf.gd/baby_groot_message_tone.pdfIn PDF document text
    • http://nadiripu.epizy.com/62346380019.pdfIn PDF document text
    • http://moxododokojuke.epizy.com/zisilopaxabi.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_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 4804 bytes
SHA-256: 01117be815ffa11cd504a9ac932607d9cdec71d44260e1497f01421f8b86c65e
font_01_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 10648 bytes
SHA-256: c7ccebf366e6c5fdba954d397cb77daadc2107cdfb71a2e8359ed53e37feb8af

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