Malicious PDF — malware analysis report

Static analysis result for SHA-256 e013b7d49f40db29…

MALICIOUS

PDF

81.6 KB Created: 2021-02-13 22:07:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 82a7a9a8553a6822aa3077419a7a04dc SHA-1: 6876bf3247772f772e3f07a8585d614793af5cc2 SHA-256: e013b7d49f40db2942235cabb8dcdcd693da34f96965eb4fed1399eb4c3c0d37
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, including one pointing to 'jacksth.ru', suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a phishing or spamming operation.

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://jacksth.ru/wb?keyword=product%20cost%20calculator%20excel%20template PDF link annotation
    • https://cdn.sqhk.co/bapulofuw/jfgijbx/talking_parents_app_pros_and_cons.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485587/normal_6021a2b5d05fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451544/normal_5ff9742a354bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393181/normal_5ffb8358ab36a.pdfIn PDF document text
    • https://dejewetekexofig.weebly.com/uploads/1/3/0/7/130775583/lifeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416316/normal_600fe411cfab5.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/fbuji1T/33795509944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480581/normal_601935b0da1ba.pdfIn PDF document text
    • https://cdn.sqhk.co/pelemobi/LZ4Bijd/city_island_airport_2_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/hchcZbG/govebedelogisiviwamim.pdfIn PDF document text
    • https://jaketomerinojox.weebly.com/uploads/1/3/4/1/134109184/59bbc89c.pdfIn PDF document text
    • https://mebevoluw.weebly.com/uploads/1/3/0/7/130739105/buxezog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454808/normal_6008cdc8e90d6.pdfIn PDF document text
    • https://cdn.sqhk.co/kapimetavis/jCVKihm/pijapokelugo.pdfIn PDF document text
    • https://devitigofe.weebly.com/uploads/1/3/1/0/131070043/b1e672456.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/fmfjj9N/object_treasure_hunt_application.pdfIn PDF document text
    • https://jesipawuba.weebly.com/uploads/1/3/0/8/130874316/tepadibe_tobaxub_viritoka_sanatuzudojido.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/lihjeXA/33613273887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484126/normal_60010a5378586.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 5288 bytes
SHA-256: 415a0849de323fa54355ac4080eeb72c029262ee77d19ba2d874f0b662cea6a9
font_01_sfnt_off000114be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BE 10588 bytes
SHA-256: b8cea31975091b84913bc3d90190ab005a57f19036238bd5d4301bb1a50578ab

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