Malicious PDF — malware analysis report

Static analysis result for SHA-256 22481f4b7a69dbef…

MALICIOUS

PDF

70.9 KB Created: 2021-03-16 04:33:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 86c06f35e18a42ff7c8674ddb51bb920 SHA-1: 03b779adbbef53fbfdcbb8a6688fa9eec6b261d2 SHA-256: 22481f4b7a69dbef3b863d84986788fdd7fe81cb9c2a4ad132ee52ff65442487
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with a primary one being https://midufefew.ru/123?utm_term=word+puzzle+2019+answers, suggesting a lure to a malicious site. The document body, though heavily obfuscated, appears to contain references to 'word puzzle' and 'answers', aligning with the phishing pretext.

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://midufefew.ru/123?utm_term=word+puzzle+2019+answers PDF link annotation
    • http://xtina.online/cuales_son_los_diferentes_tipos_de_investigacion_cientificamqikq.pdfIn PDF document text
    • http://gimemuwet.mypressonline.com/zebeb.pdfIn PDF document text
    • http://sysfix.ru/31469198017li9gy.pdfIn PDF document text
    • http://mekifaremijes.iblogger.org/lesibafenid.pdfIn PDF document text
    • http://jakartapro.xyz/dogin39k4p.pdfIn PDF document text
    • http://potozafit.medianewsonline.com/22_hebrew_letters_meaning.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/33215618871.pdfIn PDF document text
    • http://pitikudefojeken.getenjoyment.net/80847597025.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fopaguduvogo.rf.gd/37824787689.pdfIn PDF document text
    • http://zubeleboju.epizy.com/3642553398.pdfIn PDF document text
    • http://bunisanabasa.epizy.com/last_of_us_theme_song_piano_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c31faa-ab15-4ec9-b6aa-fa87f7c181ba/61723773723.pdfIn PDF document text
    • http://negavutagogo.epizy.com/firatamagamuremexotuzifo.pdfIn PDF document text
    • http://wepaxilex.epizy.com/22862921131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8ad9cb-cec9-44fb-a629-0b9507cbf735/what_is_the_average_chapter_length_of_a_book.pdfIn PDF document text
    • http://xuxalonitu.onlinewebshop.net/92018554360.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_off0000d651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 5592 bytes
SHA-256: aff72bd23236b6cd6782851e00c7f9e630f82d0212b4e9ded4da35a91f1551ac
font_01_sfnt_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 11004 bytes
SHA-256: a265b42c65850180e6012298035b7200587b2980f68ae2fe428602758c94d507

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