Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfc0018a979f721…

MALICIOUS

PDF

73.9 KB Created: 2021-03-24 20:05:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1257c160d78b74bb233fda67ce7bf43a SHA-1: ebe84d9198adf0fc9dd9207aca5fffe5d661fd52 SHA-256: fcfc0018a979f721eb6eef898cdf58c648673821952b05e7013b0675985bebfd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting it is part of a link farm or phishing operation. The document body, though heavily obfuscated, appears to be generated by wkhtmltopdf and contains keywords related to medical diagnosis, likely as a lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=chronic+abdominal+pain+differential+diagnosis+pdf
    • https://cdn.sqhk.co/woferomot/ibgiRjc/football_games_2020_dream_league.pdf
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/rimegaxokefaredof.pdf
    • https://cdn.sqhk.co/jiledexuda/UBcxNih/48523467778.pdf
    • https://metiledozixav.weebly.com/uploads/1/3/1/1/131164016/mabezitezitumajuxaw.pdf
    • https://cdn.sqhk.co/vakusukereju/OAhfjj6/misujuvibiborikawututo.pdf
    • https://cdn.sqhk.co/melipetoluf/WOjeYge/80s_music_trivia_quiz_and_answers.pdf
    • https://cdn.sqhk.co/tatidukigag/HHJQicz/crazy_golf_near_me_open.pdf
    • https://cdn.sqhk.co/ruzewekafan/idmmgdE/escape_from_alcatraz_quiz_answer_key.pdf
    • https://cdn.sqhk.co/mikakiraw/Dcm8ieh/58806483460.pdf
    • https://cdn.sqhk.co/zijigemeworu/AahaBie/siwarexevuj.pdf
    • https://cdn.sqhk.co/tixuniwe/jVjhieu/mebijediruxamudamoke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_2c9ffe7ef60b444086e920d09fef276e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d3e9b778-2e83-46cc-88f3-23bf8ef08f17/honda_power_washer_4000_psi.pdf
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_7036b85046c44bd1b2e5cc37508d246e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ffea6672-6d0a-4924-b8c6-276fd36173f3/best_mc_seeds_1.16.pdf
    • https://uploads.strikinglycdn.com/files/19ae6091-0450-4fe7-bfba-7725a8b5afe7/barbie_doll_poem_explication.pdf
    • https://uploads.strikinglycdn.com/files/6277d1b0-fdf5-459a-8ec1-326098db4371/mind_power_into_the_21st_century_john_kehoe.pdf
    • https://uploads.strikinglycdn.com/files/3e7c5d88-8ce4-4d7c-b195-65dcc97c92e4/kenmore_series_600_washer_26132_manual.pdf
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_a41db01dbc0244979c0956d461f49571.pdf?index=true
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_990621d6c77a4122950ff14da87718f7.pdf?index=true
    • 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_off0000e426.bin
6970c96d2dcb1e4045ee222c5735c14cd0a798e3bb9a3c403679fc759a00fb1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 5612 bytes
font_01_sfnt_off0000f709.bin
80038a7da4cd6f91dbb8aa0c85ce5c8728ca4c1e4eb0e1c7549bcfefae939d05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 10312 bytes

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