Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f323d4ef5b626c1…

MALICIOUS

PDF

79.2 KB Created: 2021-03-15 00:26:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 641a0c2bca891ab4f0bc6980a4307479 SHA-1: 1c1321b239b10ed47f190d33259ffbe5c95db698 SHA-256: 5f323d4ef5b626c13d5abce4ec1aea3c3ae97ca9f1fe1169556cfe5bf999605c
186 Risk Score

Malware Insights

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

The PDF document contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into revealing sensitive information like private keys or recovery secrets, likely under the guise of a security audit. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and credential harvesting campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://zajinet.ru/strik?utm_term=how+to+perform+network+security+audit PDF link annotation
    • http://3bki.ru/what_is_the_description_of_interpersonal_communicationbwrdj.pdfIn PDF document text
    • https://cdn.sqhk.co/vakiduju/TlkrTsq/text_twist_free.pdfIn PDF document text
    • http://verifybadgesbusiness.com/how_do_i_become_a_certified_recruiter_for_linkedinrqtdt.pdfIn PDF document text
    • http://mebelintera.ru/nopeliratih0ba.pdfIn PDF document text
    • http://replyua.site/fufazenon8k9d3.pdfIn PDF document text
    • https://cdn.sqhk.co/penunotati/gdWfEzY/87118474000.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385421/normal_5fe293cb1f54a.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/jajedie/pakadovumama.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406806/normal_5fcd105e8dbb2.pdfIn PDF document text
    • http://timecodes.net/2012_kia_sedona_user_manualso3ye.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/kLjbifo/fazavejipetemegotexodosif.pdfIn PDF document text
    • http://jushq.club/tovoxofobosoporadoletiw79r5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_600b38639e044.pdfIn PDF document text
    • http://bandalet.club/parsec_unit_means5crci.pdfIn PDF document text
    • http://dostafood.xyz/71497026814xeb2z.pdfIn PDF document text
    • http://teenagetutor.net/hsbc_hedge_weeklyhgyqf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416139/normal_60186ca743a7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f71ec954-cfd5-42fe-a167-ae0eb13ab6c1/the_fork_the_witch_and_the_worm_volume_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8764e047-f32e-4e31-8bdd-8a5e3b98248e/who_is_behind_v_for_vendetta_mask.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a66dc8-8767-43a2-a6b4-b1eadccd8965/venn_diagram_math_example_grade_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a9906c-2ed0-4f2c-98cc-38dc7d61706e/miller_and_levine_biology_florida_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c55dec2-0534-4b2b-93fb-1e3703194e11/ziginefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bfc96c1-6b6c-41d3-9b77-a74c76e4b157/thule_freeride_532_roof_mounted_bike_rack_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95f5631a-c57e-4ac3-8d30-edfaed9a7bfa/is_there_a_me_before_you_sequel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 5372 bytes
SHA-256: 6ac4c726f4935af83b8f9b3cd39252d1e0891dc690d46213b6f2bc4270360fb4
font_01_sfnt_off0000fb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 10600 bytes
SHA-256: fd0b271b617866bd026226a604b91d8154db1531b68aab331620b4fd061fa0c7
font_02_sfnt_off00011f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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