Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d8385d6025edb3…

MALICIOUS

PDF

74.2 KB Created: 2021-02-15 13:26:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 97375293adcab7e666b45a215e230462 SHA-1: 3a1099c222f6324c012aecef938471e4be34e789 SHA-256: 19d8385d6025edb3a1dab47a46867b73ec5321bb4feb4af54c85904f3c1ba6ec
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly indicate malicious intent, likely involving directing users to compromised or malicious 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://jottigo.ru/strik?utm_term=how+much+to+replace+toyota+prius+battery PDF link annotation
    • https://cdn.sqhk.co/kapideto/Uiievjc/pexajuzedokuvejojisiv.pdfIn PDF document text
    • https://roviselazadavuw.weebly.com/uploads/1/3/4/0/134040559/1563747.pdfIn PDF document text
    • https://cdn.sqhk.co/pagupuxu/NNdtihz/21637253252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501027/normal_5fd850294138b.pdfIn PDF document text
    • http://eroganoficial.site/dark_souls_board_game_rulesgth3u.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/chjaJ2B/best_toy_stores_los_angeles.pdfIn PDF document text
    • http://1ux.site/hotpoint_aqualtis_dryer_manualkigap.pdfIn PDF document text
    • http://dressnbuy.com/unlimited_free_vpn_proxy_chrome_extensionhyj7u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481665/normal_5ff393f246374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467979/normal_5fdb1de9c8914.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/wikurixobelu/dry_reforming_methane.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/beautiful_now_zedd_song.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_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 5468 bytes
SHA-256: bb5f0f40c8d8e2e0306aea95d32b49f98aed229538ad52a97aedc69bdd24f9aa
font_01_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 10280 bytes
SHA-256: e5e895f8f21846889cdcec68412fa269a207e462928117f828a43ee8753fd19a

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