Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ab867d92f210db…

MALICIOUS

PDF

74.2 KB Created: 2021-02-25 17:55:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8b4d7b296b3b2cdcd870a152729cbc9b SHA-1: 089a2a4cb20c5a5d0d032a805c5d07903135b285 SHA-256: 88ab867d92f210db5f828ddf902429fc8f141156b66c2399921d3cd065ecd9e3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, 'https://baarspo.ru/strik?utm_term=what+does+code+f10+mean+on+a+kenmore+oven', suggests a phishing or scam attempt by disguising malicious links within seemingly relevant search results. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=what+does+code+f10+mean+on+a+kenmore+oven PDF link annotation
    • http://letgtma.bid/imperatives_exercises_with_answersvvqfa.pdfIn PDF document text
    • http://keysecret.ru/60810199568560td.pdfIn PDF document text
    • http://betixisu.22web.org/guided_meditation_for_sleep_by_lauren.pdfIn PDF document text
    • http://help-business-media.com/povidilopowujofcjete.pdfIn PDF document text
    • http://invitesistem.ru/spanish_alphabet_worksheet86m3o.pdfIn PDF document text
    • http://kolunikikirade.22web.org/limagivulopitanirix.pdfIn PDF document text
    • http://leomannapov.com/drag_racing_gear_ratio_chartvx2rs.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/what_is_the_definition_of_the_word_quran.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/kubota_bx25_attachments.pdfIn PDF document text
    • http://jasapremium.xyz/59025829393f0pf.pdfIn PDF document text
    • http://vigastlens.xyz/hydraulics_handbookoshwt.pdfIn PDF document text
    • http://zuviferufudufa.iblogger.org/high_resolution_mass_spectrometry_chemguide.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
    • http://fagufobukabovu.epizy.com/oxford_advanced_dictionary_free_full_version.pdfIn PDF document text
    • http://gaxokumixopo.epizy.com/charli_xcx_vroom_vroom_ep.pdfIn PDF document text
    • http://figijosi.epizy.com/novabo.pdfIn PDF document text
    • http://notaruk.rf.gd/93683340669.pdfIn PDF document text
    • http://bilunijo.epizy.com/slayer_money_guide_osrs.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/26379241260.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_off0000d6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C6 5300 bytes
SHA-256: ac7f4d7bf2d95331734ca1d36706bb9ba91c7e485b173a9245e1f08a068120a7
font_01_sfnt_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 10944 bytes
SHA-256: 53169cc3c939b1b1ce7701b553547beecd2d025b28ab3e36be3abe74c4c6bce6
font_02_sfnt_off00010d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D61 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3