Malicious PDF — malware analysis report

Static analysis result for SHA-256 35debbcc82a3fd2a…

MALICIOUS

PDF

117.5 KB Created: 2021-03-09 09:05:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ebb5f36890196914b478974fe2d915d4 SHA-1: b7988bf5dc617442b067c6deb40db2cdd769b94b SHA-256: 35debbcc82a3fd2a22be27c90653a0609ba65811c0577f4cb141259890905370
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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://gimoguvi.ru/strik?utm_term=casio+g%2527zone+ravine+vs+boulder PDF link annotation
    • https://cdn.sqhk.co/roretuduva/cBVvhic/roblox_promo_codes_2020_not_expired.pdfIn PDF document text
    • https://cdn.sqhk.co/revikokelobu/djbHzKq/94840918605.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/fjgGPt4/zirifuzo.pdfIn PDF document text
    • http://esplus.pro/355014248991pdbu.pdfIn PDF document text
    • http://regvoolkim.website/gisawinojibemixobonelewyh3s.pdfIn PDF document text
    • https://cdn.sqhk.co/repipedifavi/GRp8jcY/9038961081.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/PhicVgC/learn_spanish_latin_america_or_spain.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/tenor_madness_chords64any.pdfIn PDF document text
    • http://filuniguwol.22web.org/jurob.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/hfieifH/cool_math_games_papa.pdfIn PDF document text
    • http://nizuvifoko.iblogger.org/adobe_reader_english_free.pdfIn PDF document text
    • http://digitaloffice24.ru/aquifero_guarani_processo_de_formao8mp56.pdfIn PDF document text
    • https://tufelonidozuwux.weebly.com/uploads/1/3/2/6/132681512/3497868.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/Q4rjcij/vokupijuvamotugumilejod.pdfIn PDF document text
    • http://damita.fun/kumon_3rd_grade_math_worksheetspcaxk.pdfIn PDF document text
    • https://kazowotamije.weebly.com/uploads/1/3/4/0/134012594/5146296.pdfIn PDF document text
    • http://mklhhhh.space/what_color_is_similar_to_magentaj4826.pdfIn PDF document text
    • https://kugibunil.weebly.com/uploads/1/3/1/4/131437599/desasu_sedudusi_visimigus_mazof.pdfIn PDF document text
    • http://lesantyqas.online/pikenedenafimedimirqz0co.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/b15454.pdfIn PDF document text
    • http://bumegafonuvitop.22web.org/11925758745.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fowodusozid.epizy.com/oedipus_the_king_creon_character_analysis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000179ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179AD 5180 bytes
SHA-256: 44e1fdc22240a49f640ed33cd9055827350a0d238c4bc3c07b96f1bc799bb35d
font_01_sfnt_off00018b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B6A 11944 bytes
SHA-256: 14824e306092e9ef5e618ea8849982adc0e67723efebb759786dcff1b1ec04af
font_02_sfnt_off0001b37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B37D 16076 bytes
SHA-256: 050cca2678d7435c270027ff58d84efa212ea3c5592871ae9bdc0d1e185112d0