Malicious PDF — malware analysis report

Static analysis result for SHA-256 07cfefdca3567e2a…

MALICIOUS

PDF

74.4 KB Created: 2021-02-25 10:23:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 206106c72027c2545b4a09848e6a7cb9 SHA-1: 2a99947e807d860b806d4b7c45b378cba51d3f71 SHA-256: 07cfefdca3567e2a917f7f60eefc5507ee40627d16ff54d2621f8f22a22d0ad1
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggest a phishing or malware distribution intent. The document body, though heavily obfuscated, contains text related to installing Windows 10, likely a lure to encourage clicks on the malicious links.

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://jottigo.ru/123?utm_term=how+to+install+windows+10+in+free+dos+laptop PDF link annotation
    • http://idealica-itufficiale.website/587034530239sdyb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_601e697e21f6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407064/normal_5fee2591e67e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449178/normal_5fec06bc091bf.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/logitech_mk710_review_cnet.pdfIn PDF document text
    • https://gomamuna.weebly.com/uploads/1/3/5/3/135304292/foliwuvexe_jiweviretexuz_zunafoliwumiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501383/normal_6032edf8720b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_601741197083c.pdfIn PDF document text
    • http://bred-enligne.com/gozisutoruh8gex.pdfIn PDF document text
    • http://wersita.fun/samsung_c480_transfer_belt_resetyax79.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/oracle_11g_sql_developer.bat_not_found.pdfIn PDF document text
    • http://okrasote.info/85018800858m37zc.pdfIn PDF document text
    • http://mazafaka69pussy.online/battery_charging_indicator_free9odsc.pdfIn PDF document text
    • https://paparudedolenod.weebly.com/uploads/1/3/4/6/134686514/putuzetinu-xubuvazunevozit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482206/normal_5fc762673abf6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://newemepakirid.myartsonline.com/how_to_pair_plantronics_voyager_headset_to_computer.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_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 5284 bytes
SHA-256: c3593d11ab14656eb2ab0aa20b17e45c9f61ff5e784b4f832a9c3b8c9440fc9c
font_01_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 10016 bytes
SHA-256: 532965faa049c704a874567cf5867e38dae0eab189f4499645777d0cbfb6c9cf

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