Malicious PDF — malware analysis report

Static analysis result for SHA-256 c242b1f7f1b876b4…

MALICIOUS

PDF

84.5 KB Created: 2021-03-10 16:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c523c7d8478c5827cd52be97719538fd SHA-1: c9102e59d6c94d8bf93f4311c15603c395ef9ca5 SHA-256: c242b1f7f1b876b435ec66089d82634377936c7b98d25de75cdb9d9ab30ca15e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=law+of+sines+and+cosines+worksheet+word+problems PDF link annotation
    • http://nokojatagi.mywebcommunity.org/cracker_barrel_menu_breakfast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_6013645707168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5fd9867e56099.pdfIn PDF document text
    • http://1xbet-registrat.site/excuse_letter_format_spacing2lblz.pdfIn PDF document text
    • http://sedobepotorosi.22web.org/26407683186.pdfIn PDF document text
    • http://xakaderinetatu.mygamesonline.org/ask_the_dust_full_movie_online_free.pdfIn PDF document text
    • http://letgtma.bid/harry_potter_deathly_hallows_part_2_cast_age9k7y0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/37663774515.pdfIn PDF document text
    • http://witesenigo.atwebpages.com/vowelimakilixuxivisu.pdfIn PDF document text
    • http://fixadamobus.epizy.com/new_bhakti_song_ringtone_free.pdfIn PDF document text
    • http://goruwon.epizy.com/14302611866.pdfIn PDF document text
    • http://tipipigi.atwebpages.com/59641026927.pdfIn PDF document text
    • http://kasarokoxakuke.epizy.com/catholic_high_school_pj_uniform.pdfIn PDF document text
    • http://wakagita.rf.gd/annual_report_design_awards.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/bogan_senthoora_audio_song_free.pdfIn PDF document text
    • http://xetisovabad.rf.gd/78430534930.pdfIn PDF document text
    • http://sezajebufixi.epizy.com/best_cartoon_wallpaper.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 5420 bytes
SHA-256: a7b2c8c12946ab1713e594acf2b27e22da7a7cc25b8bbf258959938e6811bd82
font_01_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 11216 bytes
SHA-256: 0ea4b8a2111e749e187c2f957635b9069ced64c4feb50bcc85fd8ca4d5c7eacb
font_02_sfnt_off00011f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F83 16072 bytes
SHA-256: 062f8a7185608a18dbd56baf48eb14c791e3c6ea8866a2ddd6a03467109098f1
font_03_sfnt_off00013422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13422 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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