Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85f451f7ca24f1f…

MALICIOUS

PDF

78.3 KB Created: 2021-04-08 12:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e78e47c2d35168a1aab1a0b328479b73 SHA-1: a82f9053b8099b4e63a5f957ead36a6d93a72da7 SHA-256: a85f451f7ca24f1f553ddf92c98905266b47db9681d5afb74c36eab296162992
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded links, many pointing to disposable domains and using UTM parameters, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains keywords related to educational materials, likely a lure to encourage clicks on the malicious URLs.

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://gimoguvi.ru/strik?utm_term=pre+kindergarten+workbooks+pdf PDF link annotation
    • https://cdn.sqhk.co/zejegure/dagfijS/battle_chasers_nightwar_burst_2.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/WgdifVy/85012267472.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/ggFq6jd/52847011873.pdfIn PDF document text
    • http://devuweza.scienceontheweb.net/coller_plusieurs_en_un_seul.pdfIn PDF document text
    • https://cdn.sqhk.co/rakapuvad/ooXCcjh/logo_quiz_answers_level_6_wholesale.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/2ZhdgdS/zizebubirudixinasulid.pdfIn PDF document text
    • http://prostotit.site/codingbat_logic_2_answers04ws9.pdfIn PDF document text
    • http://prosale.company/nesazepumokizifobajubgbrtz.pdfIn PDF document text
    • http://cashtanks.fun/how_do_you_read_the_expiration_date_on_a_julian_calendarxmmck.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/pokukobim.pdfIn PDF document text
    • https://cdn.sqhk.co/nimotixalulo/78GgiaH/productive_habit_tracker.pdfIn PDF document text
    • http://madewithsunshine.com/quorum_sensing_reporter_kittz4xa.pdfIn PDF document text
    • http://womans30planet.com/citizen_gn-4w-s_eco_drive_pricexe27f.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/jigirgj/99151094258.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fajazimigig.atwebpages.com/78313166627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474bef0b-1b07-4654-8bfc-cdb3cc153de1/67624090512.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/15830788493.pdfIn PDF document text
    • http://futakanawus.onlinewebshop.net/richard_lustig_learn_how_to_increase_your_chances_of_winning_the_lottery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb296ef-df34-48b1-9e8f-e1fa9cf21400/kyocera_laser_printer_admin_password.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_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 5476 bytes
SHA-256: dc025b4ec4179761b5ae81a699df8a462ae439d1629efeb2265e538258f3b1ac
font_01_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 10844 bytes
SHA-256: 7f4bb395b7934649857ef3cdc83d0a4a4c77c983f2a5c305d2d3ea7cea7ee4cc

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