Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f584c398fa05a7…

MALICIOUS

PDF

94.4 KB Created: 2021-04-02 03:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 99b805ec3d7c8274f53ed288327281e9 SHA-1: f20a6bfd5010d62f509f34febad5b7d9e34e5e1c SHA-256: 77f584c398fa05a7cdce0ab026396c425534f1975014aae22ddd0c81309d3bad
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://botokaw.ru/strik?utm_term=what+are+the+different+types+of+drawing+tablets PDF link annotation
    • https://cdn.sqhk.co/mujawiru/hajjkUs/22478957656.pdfIn PDF document text
    • http://roxanuveguwiz.22web.org/nifadiwamejexepaxovum.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/ibKesZG/based_zeus_texting_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/dujepiwewi/TijmVSq/masterclass_android_app.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/iETeYhh/shipwreck_cafe_michigan.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/dgh47gj/smashbox_makeup_brushes.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/vmMHidQ/girl_squad_fashion_bff_fashionista_dress_up.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_6025a59d0bd49.pdfIn PDF document text
    • http://peregukejipesa.iblogger.org/bozinixomivewedev.pdfIn PDF document text
    • https://cdn.sqhk.co/vumajotiwog/WjeuLYX/32463968269.pdfIn PDF document text
    • https://cdn.sqhk.co/kurinunuwor/7jgUjta/game_ninja_arashi_2_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408984/normal_5fc949375f2ac.pdfIn PDF document text
    • http://gizaripe.iblogger.org/apsrtc_bus_pass_application_above_ssc.pdfIn PDF document text
    • https://cdn.sqhk.co/nigezufi/sjh9mgh/bidojejelufimikidajuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwokosokif/jfnifig/panini_fifa_365_adrenalyn_xl_2020_codes.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://kavotipuwevir.epizy.com/midodoritowiw.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/aune_t1se_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/luzudumesokidopa.pdfIn PDF document text
    • http://pugagewuda.rf.gd/free_underground_hip_hop_albums.pdfIn PDF document text
    • http://pelubameta.epizy.com/pedinadew.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/good_verbal_communication_skills_in_the_workplace.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/31153358530.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/holy_books_of_hinduism_free.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_off00012380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 5440 bytes
SHA-256: 8209b0e8859d309d28dedfd6113251a43c5d8cd43b4d177871d98ec30a673e2c
font_01_sfnt_off00013615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13615 11684 bytes
SHA-256: d15cd17ae8835dfd717d4521ca14465aa0c1fa9950a9080fc682aa1c55eb6cf5
font_02_sfnt_off00015dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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