Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5be5dadf790da1…

MALICIOUS

PDF

88.8 KB Created: 2021-04-08 00:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65fb4ba48202e14e93982cdae795f4d1 SHA-1: b00253c8583e2e4d9a4f43d6d5d895bd395a443a SHA-256: bc5be5dadf790da1c97a5189913560a110bd49bc3eb66ff7239026f831bb6ea1
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 exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further confirm its malicious nature. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=salesforce+knowledge+base+implementation+guide
    • https://cdn.sqhk.co/wogokodu/ib3gc9Y/card_castle_meaning.pdf
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/8ab2152bc9197.pdf
    • https://cdn.sqhk.co/bubiwalifeda/idXmege/sureduran.pdf
    • https://cdn.sqhk.co/domuzusud/WjajdC5/hip_hop_old_school_hits.pdf
    • https://static.s123-cdn-static.com/uploads/4369173/normal_5ff6591fad74c.pdf
    • https://cdn-cms.f-static.net/uploads/4367951/normal_600eac2b10d7e.pdf
    • https://cdn.sqhk.co/venifirub/jmf8jgg/bededajiriwaxufunuta.pdf
    • https://tajixuxax.weebly.com/uploads/1/3/4/7/134751877/kunawolubad.pdf
    • https://vawovuwowoxug.weebly.com/uploads/1/3/4/0/134040368/wozasikegevi_nuzegezibu_bibuwevusanapa_mifume.pdf
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/luxezo.pdf
    • https://lazofakivew.weebly.com/uploads/1/3/1/4/131406449/lexibutegubol.pdf
    • http://rejemezurufoveg.mywebcommunity.org/how_to_reset_disabled_iphone_without_computer.pdf
    • https://cdn-cms.f-static.net/uploads/4378171/normal_606c76b8de26c.pdf
    • https://cdn-cms.f-static.net/uploads/4368237/normal_606e023e904ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_08de0fde116244c29f216ff789d0b626.pdf?index=true
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_1379f7f41f29498a8aac8bcf71dd0f83.pdf?index=true
    • http://moxododokojuke.epizy.com/how_to_remove_drm_from_apple_music_on_iphone_without_computer.pdf
    • https://79ab8074-8148-4faa-9219-f6cdfa35bc15.filesusr.com/ugd/99e004_0fef450c94b04b1085c9ba614c78adb0.pdf?index=true
    • http://wufagezigedo.onlinewebshop.net/jevisarikupilipolijasak.pdf
    • https://502e425a-54a0-4661-a3e6-c6e116bdb13d.filesusr.com/ugd/10da26_f27d21e5f7304154be3ec5fa9e57f6b3.pdf?index=true
    • http://jizuwugi.rf.gd/formato_certificado_medico_mexico.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f37.bin
bd329c930a7b23ce13257f7ee031b2661e45e7f1a28c85e694c1f43f6b73c513
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F37 5756 bytes
font_01_sfnt_off000122c1.bin
8cf5a16435e8de3e1baa472056867037ddfc839e6eec792b47422a6bb1981589
pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 10796 bytes
font_02_sfnt_off000147c7.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x147C7 4324 bytes