Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e98e399bf27cdd…

MALICIOUS

PDF

82.9 KB Created: 2021-02-19 02:13:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 39ec3a95a9cf34b4e8541aa84f85cb6a SHA-1: 2adfe8a7b6396687b6555f04739d1147899a63eb SHA-256: a5e98e399bf27cdd978603f1d28df734735df547c7fff76bbb82715c0e65f709
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services and domains with unknown reputations. Heuristics indicate a link farm designed to distribute other malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via the linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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=rock+climbers+training+manual PDF link annotation
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/744996.pdfIn PDF document text
    • https://cdn.sqhk.co/zalopubid/ciijeF6/rummikub_game_tiles.pdfIn PDF document text
    • https://cdn.sqhk.co/vumajotiwog/Y0whihd/clawbert_toytown_apk.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/desonetijitodu.pdfIn PDF document text
    • http://gopagagoraxu.22web.org/2717095834.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/jjjEBwJ/56822782503.pdfIn PDF document text
    • http://stickerrus.ru/77308596759uds21.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxezitowefi/eghhhie/600_to_800_words_is_how_many_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/bemoranoz/iiCogde/the_dead_live_among_us.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/gKpgfjw/dimikagefamode.pdfIn PDF document text
    • http://mbfsopg.com/is_the_roomba_s9_worth_itnrkpc.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/f4O9iiv/registro_brasfoot_2020_funcionando_atualizado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pexoxusipatesu.epizy.com/tixupi.pdfIn PDF document text
    • http://fuluputig.epizy.com/de_acuerdo_en_ingles_formal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 10780 bytes
SHA-256: a8b2f4a992dcc090aa4d5efc3ec5d1497107974e6031810999e1d9562774b982
font_01_sfnt_off000105d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 5328 bytes
SHA-256: 4f45059f0445f6c5a9687b65f6a68b01015c7102182feba20ee50c175d60cf8c
font_02_sfnt_off000117e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E4 11308 bytes
SHA-256: 4a06ce859b47c25512fe1b8030ce507ab4047ee51f58c7bb30ddb264892008ab

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