Malicious PDF — malware analysis report

Static analysis result for SHA-256 3abddd76aee8b576…

MALICIOUS

PDF

76.1 KB Created: 2021-03-22 03:21:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ac335088d080e5c6016b20448269134 SHA-1: 3872219c2e4d50fce5d4e650fe2037525bf1884a SHA-256: 3abddd76aee8b57634ebd9fbf71113c4e86681abccd81414dffa57050cee436b
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 domains, and one prominent URL that appears to be a lure related to nationalism and patriotism. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting a phishing or redirection scheme.

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://botokaw.ru/strik?utm_term=how+to+promote+nationalism+and+patriotism
    • http://tradestaroffice.com/redapejoxikk5vg.pdf
    • https://cdn.sqhk.co/gutinisiv/bTcgpib/guess_the_song_by_lyrics_quiz.pdf
    • http://fito4ka.xyz/28717531526ns6p6.pdf
    • http://kayikciakademi.com/imac_user_guide2e7jq.pdf
    • https://cdn.sqhk.co/redexisa/dTiihfh/25777214237.pdf
    • http://italdom.fun/370667805043nrkb.pdf
    • https://cdn.sqhk.co/xumupojamax/ZmW5jcM/tamil_movies_2019_tamilrockers_isaimini.pdf
    • https://cdn.sqhk.co/lojibuwe/iaNVfif/basketball_games_tonight_on_abc.pdf
    • https://wamurereleveti.weebly.com/uploads/1/3/5/3/135392703/3150358.pdf
    • http://meweremidef.iblogger.org/free_printable_th_phonics_worksheets.pdf
    • https://junowebabozem.weebly.com/uploads/1/3/5/9/135965754/donokitaledonorupopa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pejebitopaw.rf.gd/28739086087.pdf
    • http://gokixedotoj.epizy.com/basic_atomic_structure_worksheet_doc.pdf
    • http://tulukinuloze.epizy.com/fufujelex.pdf
    • http://memezuxel.epizy.com/platelet_count_in_pregnancy.pdf
    • http://ludujefu.epizy.com/astm_a370-_17a.pdf
    • http://bakotisimipivok.rf.gd/listview_example_in_android_studio.pdf
    • https://uploads.strikinglycdn.com/files/a2b55ac0-a3b2-4581-98a4-a10bd6db56ed/72944181521.pdf
    • https://uploads.strikinglycdn.com/files/f040ef5a-d5fc-4815-b421-c5f2571c7052/hp_laserjet_3055_toner_price.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb4.bin
46be12b9c65d48a43ac8a306eff953537df1977d175e3cabd043f611cbab32ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 5160 bytes
font_01_sfnt_off0000ff33.bin
9988eb97811b507837d2d0e30e482e8703fd5766ba614821a522a9e0e374fd12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 10452 bytes

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