Malicious PDF — malware analysis report

Static analysis result for SHA-256 0136ea62957556d6…

MALICIOUS

PDF

73.1 KB Created: 2021-01-27 04:40:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9b924f215a77cbf5250c26cd0bb54d19 SHA-1: 0aa647dcd3f7c9136cf76362271c2f1c87767915 SHA-256: 0136ea62957556d64c7b3ce85497ec3b963ef8314f22a9b69038cafae9ebec21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is classified as malicious by ML and ClamAV, indicating a phishing or trojan threat. It contains multiple external URIs, including one that redirects to a link farm on disposable hosting, suggesting an attempt to obscure the final malicious destination. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The primary attack vector appears to be directing users to malicious content via embedded 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://jacksth.ru/wb?keyword=hepatitis%20a%20vaccine%20side%20effects PDF link annotation
    • https://romadixisom.weebly.com/uploads/1/3/2/6/132681692/tatesavifekuwotanuni.pdfIn PDF document text
    • http://marketop.club/82315442764srzi8.pdfIn PDF document text
    • https://kimodoximotoden.weebly.com/uploads/1/3/1/8/131856266/6071355f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426690/normal_5ff615ca99244.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/4pWkO2v/notification_sounds_tamil_funny_dialogues.pdfIn PDF document text
    • http://huaweistoreukr.xyz/61136039035mcqar.pdfIn PDF document text
    • https://cdn.sqhk.co/meradipuwiz/pgcIHhi/space_shuttle_pilot_simulator_apk.pdfIn PDF document text
    • https://duketexu.weebly.com/uploads/1/3/4/7/134725944/revefibajavafoful.pdfIn PDF document text
    • http://newyearshop.site/fefobanebepadapefie4fmq.pdfIn PDF document text
    • https://posenumu.weebly.com/uploads/1/3/0/7/130776111/xadufujukupifozete.pdfIn PDF document text
    • https://jasujoru.weebly.com/uploads/1/3/1/4/131483343/malugilolu.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/jaKhfZ5/35861240097.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/satudifin/aldi_magnum_dishwasher_tablets_safety_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/functions_vertical_line_test_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/32318080572.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_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 5040 bytes
SHA-256: 68eb82ebfb06c722796b05634f8a53da56ce7b0a1bc71b3b75e6ab4b4c59e2a5
font_01_sfnt_off0000f2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 10760 bytes
SHA-256: e7f69c53e0069d93d59f4450d1cc0a65bd18f1fc33fd39df532a4eaad3cb6723

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