Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff793e862a3834f…

MALICIOUS

PDF

79.8 KB Created: 2021-06-03 10:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d25d6c5d61ff1992ffe4dd0380e2b1d9 SHA-1: d156798b8193192d628c6bab441075c7712166b4 SHA-256: 7ff793e862a3834f318890e5a63d023e08a2a7e8a38f3680e9caaa5549e50081
134 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing infrastructure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL related to 'how to say dermatologist in spanish', which is likely a lure to encourage user interaction with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/pbw?utm_term=how+to+say+dermatologist+in+spanish PDF link annotation
    • https://dodivivedi.weebly.com/uploads/1/3/3/9/133997878/bufenugenutu_pipeb_sarabolik_lumavoxamaf.pdfIn PDF document text
    • https://nekekijubexofus.weebly.com/uploads/1/3/4/5/134587401/69a1201e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447878/normal_60098ab65aaaf.pdfIn PDF document text
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/bikatoxiwevixefevex.pdfIn PDF document text
    • https://jozisilefetaj.weebly.com/uploads/1/3/4/4/134476246/soketamu.pdfIn PDF document text
    • https://nalagaruzu.weebly.com/uploads/1/3/3/9/133997435/627037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418985/normal_6064e3c175c71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_601e727dd3685.pdfIn PDF document text
    • https://malabukepi.weebly.com/uploads/1/3/0/9/130969546/robufini.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450424/normal_60b45ad957430.pdfIn PDF document text
    • https://dexuganepo.weebly.com/uploads/1/3/1/6/131608037/sanelaxow_jobetanerur_vuxefib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a3b513-dac3-4ad0-83ab-e36107d308fd/adding_subtracting_fractions_unlike_denominators_worksheet.pdfIn PDF document text
    • http://fajopab.pbworks.com/w/file/fetch/144549426/the_hobbit_comprehension_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/905a4f23-23b8-444d-a565-3a1fec7ffda1/exercicios_adjetivos_e_pronomes_possessivos_em_ingles.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/how_to_check_court_marriage_certificate_online.pdfIn PDF document text
    • http://wekibivu.pbworks.com/f/33921056396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f02f53-d72b-4d39-a463-a849b7cdfdaa/42497237434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47569ec4-dbbf-448d-8671-b8f2959fc139/fender_mustang_gtx50_modelling_guitar_amp.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/kojelugetafaw.pdfIn PDF document text
    • http://tarogifere.pbworks.com/f/tcu_guide_book_2020_20_for_diploma.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144423180/family_and_friends_3_special_edition_free_download.pdfIn PDF document text
    • http://pefumugat.pbworks.com/w/file/fetch/144537228/ferugakobar.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/w/file/fetch/144483813/how_to_update_my_asus_transformer_tf101.pdfIn PDF document text
    • http://fevosezew.pbworks.com/f/famisevodegapimakokokuzuk.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/w/file/fetch/144527220/german_short_stories_epub.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_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 5528 bytes
SHA-256: 9475874bd2bc1d9dc13ed1479da9ea70fa69c5a6ceab49c314fe92ed25ad07c3
font_01_sfnt_off00010f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3F 10020 bytes
SHA-256: 5f50ebb7b9e17ec9ec9aae927d7b2171dd4f134739aae20211dde6078ba8071f

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