Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f0ca211a2e8947…

MALICIOUS

PDF

78.3 KB Created: 2021-02-24 23:26:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 55d9a5d809444ed5cf9f9da4d937ed2c SHA-1: 18614b9eb3644b38add48dda58d333becd84849f SHA-256: f0f0ca211a2e8947a8e762e32193abf4d328b212ec13da888456f245f7185574
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to a domain that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to a light novel summary, which is a common tactic for phishing or malware delivery. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest it's a phishing or malware distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=accel+world+light+novel+volume+23+summary PDF link annotation
    • http://pozijuza.scienceontheweb.net/82847278012.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473432/normal_5ff11aae3ba34.pdfIn PDF document text
    • https://vejotawugupexo.weebly.com/uploads/1/3/4/7/134756202/mesuxelavidaz_katurekodu_lufel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413120/normal_5ff1c1f25069d.pdfIn PDF document text
    • https://satufimitu.weebly.com/uploads/1/3/4/7/134715308/mabazozilefenikiga.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/noxonakinugonej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_6023f5881b302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412391/normal_601aac9930ce5.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/saheeh_international_quran_arabic_text_and_english_translation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449614/normal_6034db598f5ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jetubomubiko.epizy.com/lanubun.pdfIn PDF document text
    • http://xigakixu.epizy.com/bevadulatuba.pdfIn PDF document text
    • http://nibatozov.epizy.com/elgato_game_capture_card_software.pdfIn PDF document text
    • http://wozunitififut.epizy.com/cookie_sheet_cake_icing.pdfIn PDF document text
    • http://roruxarese.rf.gd/adiemus_karl_jenkins_sheet_music.pdfIn PDF document text
    • http://lekazukexofa.rf.gd/convert_into_word_using_ocr.pdfIn PDF document text
    • http://juvejuvikanu.epizy.com/sopimer.pdfIn PDF document text
    • http://pogitijerilux.epizy.com/47709267886.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_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 5892 bytes
SHA-256: 6743c7f888734a4b1d3db0dfcba0c6291a3de69f8e3b16817e15793e578eee92
font_01_sfnt_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 10636 bytes
SHA-256: 1ba8ebcf4939488adcb88d9a3f6b2ecd005878ba6479a32602ca9e72bb6a71dc

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