Malicious PDF — malware analysis report

Static analysis result for SHA-256 1072a0dec724a54b…

MALICIOUS

PDF

69.7 KB Created: 2021-02-13 13:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 47c3b86fad43cf3c9c640d49d2126833 SHA-1: eea834b972e47636262ad75396a6c643de3659d4 SHA-256: 1072a0dec724a54b64705880fd32487a59f4a27d09f2b7146fd23debddf9f4f9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or redirection mechanism to obscure the final malicious destination. The document body, though heavily obfuscated, appears to be a lure related to song chords, which is likely a pretext to drive users to the malicious URLs.

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://baarspo.ru/123?utm_term=mas+alla+del+sol+cancion+religiosa+acordes PDF link annotation
    • https://cdn.sqhk.co/jirudumom/UtjagjC/bein_sports_connect_subscription_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/volumusigu/jjhbbHh/6288007779.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500432/normal_6003c0163469f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423443/normal_6026b622a0489.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460966/normal_5ff18c65a91a8.pdfIn PDF document text
    • https://cdn.sqhk.co/gudopokobipa/FhfYQie/64185766583.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupesiparu/jdjdhcf/cooking_joy_2_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_5fe7d0e90c72d.pdfIn PDF document text
    • https://cdn.sqhk.co/riragimi/iiiYSZi/lomakapidefubuduzom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450438/normal_601d03054c880.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ramapenutizawa.epizy.com/91804862596.pdfIn PDF document text
    • http://wapudajikipidem.epizy.com/16816705117.pdfIn PDF document text
    • http://turegipamikum.epizy.com/platform_shoes_goldfish.pdfIn PDF document text
    • http://dogugamegomijit.rf.gd/88855229594.pdfIn PDF document text
    • http://rovafitazilom.epizy.com/zetewojo.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_off0000cf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8B 5112 bytes
SHA-256: b1240530b0f0ff5a183f49048a65ca6172593a5c5870fbc69b02b554e3034fe1
font_01_sfnt_off0000e103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE103 11912 bytes
SHA-256: e46de28de4b3c2183992da8b747bbd10e7871ce40a57006306f3ca9db7da062a

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