Malicious PDF — malware analysis report

Static analysis result for SHA-256 526147042b170d8f…

MALICIOUS

PDF

79.1 KB Created: 2021-03-29 17:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 79a1357b2387d87f3860ac13d3225a25 SHA-1: dc24809f1cefc1dda22519dd426da86c35bb0e76 SHA-256: 526147042b170d8f3216cbdf5979aa6fe73eeaf30a51df983befde968b393916
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/award?keyword=atherosclerosis+book+pdf PDF link annotation
    • http://fagumawegoleleb.mypressonline.com/krishna_yajur_veda_in_kannada.pdfIn PDF document text
    • http://twirlini.com/climatronic_golf_5_manualkwi70.pdfIn PDF document text
    • http://detonicro.website/foreign_service_officer_test_pass_rateptoz9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369507/normal_600edbaa30876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_5fda012e2488c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464055/normal_605c857e180f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422367/normal_605a2a6bccbe0.pdfIn PDF document text
    • http://gejurabek.getenjoyment.net/widajolalusakalojugub.pdfIn PDF document text
    • http://juvovagesubo.mywebcommunity.org/nowapobomev.pdfIn PDF document text
    • http://help-nanny.site/tedotimi5ic2u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449788/normal_600f1f9ada1db.pdfIn PDF document text
    • http://fitokaps.xyz/volifikul1hvzb.pdfIn PDF document text
    • http://creamwalls.online/32178724970yil2q.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/fe07b5c5-378c-4908-a3c6-d57669009177/61399006172.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/new_kill_team_starter_set_review.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/rabbit_anatomy_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a34621-f824-4b7f-a3c7-48b64b8a2a36/how_to_write_a_good_rap_flow.pdfIn PDF document text
    • http://jadivepijuga.myartsonline.com/aashto_lrfd_bridge.pdfIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_15ba026bff4d411789b362d799756bee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e69d98f-3c01-4923-8721-9bfb70b23411/dagafekapamawab.pdfIn PDF document text
    • https://235a1a37-2bc9-4d3b-8f1d-d3952ad9fba8.filesusr.com/ugd/3111f7_342c418fa77b4c6a9343a2bf19e4d777.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/the_12th_planet_summary.pdfIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_1c791924b5404e89bf61a8cf163a6772.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/abbf0ab9-bdab-4e5d-9fce-9e963a2fef95/how_do_i_pass_the_aapc_cpc_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a50c60c-051b-43c0-9572-e63241157063/47970313551.pdfIn PDF document text
    • https://medlineplus.gov/atherosclerosis.htmlIn 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_off0000e90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 4908 bytes
SHA-256: 2ae1d8190dbe3579fa5184ab3cf2aac813873f8ab5b3a01b313cc87ed504bfe2
font_01_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 11364 bytes
SHA-256: 9439dadbbebf121d9b53566ac732c4e6a9e4cbafb2e37141cd7ed045b5091ffe
font_02_sfnt_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2