Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c51592993a6934…

MALICIOUS

PDF

68.0 KB Created: 2021-02-24 17:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a4dafcf987c4994b1ffea0feb78af4ae SHA-1: 16f4498addb86059e53abb6d560c13d5ae8507d9 SHA-256: 62c51592993a6934e9f63edfff47aabb8d4cd2dd5d11c58b9815566390647a27
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains a large number of embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying the document as a link farm hosted on disposable domains.

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=how%20do%20i%20fix%20the%20tape%20jam%20on%20my%20dymo%20letratag PDF link annotation
    • https://cdn.sqhk.co/nalomuxe/geOhcY4/rts_project_momentum_program.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/fngicjj/36131660330.pdfIn PDF document text
    • http://kebotup.66ghz.com/64813046739.pdfIn PDF document text
    • http://dulexip.22web.org/bowflex_xtl_parts_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469631/normal_5fdde27aad9e3.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/gCKQghP/build_a_bridge_with_popsicle_sticks_video.pdfIn PDF document text
    • https://cdn.sqhk.co/susotizakaxe/hMjf3he/oder_skins_for_roblox_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_60270f37224db.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/2gjxGX3/28090250650.pdfIn PDF document text
    • https://cdn.sqhk.co/dasewugiru/Jij5snn/hearthstone_wild_rogue_kingsbane.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/ihibgfO/85688839771.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475562/normal_5fe0c78038512.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokaxufoluzep.epizy.com/dozagelifunebixokezun.pdfIn PDF document text
    • http://zuniguvip.epizy.com/kiehl_s_face_mask_sheet.pdfIn PDF document text
    • http://zasagugidi.epizy.com/novedotubonevebe.pdfIn PDF document text
    • http://fimogaselan.rf.gd/letter_format_for_job_transfer.pdfIn PDF document text
    • http://terofiwewu.rf.gd/jipigewelenososisil.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_off0000ccc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC3 5576 bytes
SHA-256: 02820dec47b4e9e85bc2c872ec5cb997bfa296d6268acd4f8d158a23042aaf64
font_01_sfnt_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 10232 bytes
SHA-256: d7b07ea0d3d4c73dee0006f9bbb566cb189f8298888a20557082045dff08e9f6

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