Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ffa73b1a04a3a7…

MALICIOUS

PDF

81.0 KB Created: 2021-03-07 17:32:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bf1ee4460a95b1f20b48ea1f9dbe1352 SHA-1: 24df6588d699d36edf20001adf88e69327823341 SHA-256: c7ffa73b1a04a3a767a2323bdcc3ddcfc80e961a9d055d01cef1e147f504c912
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/wix?keyword=the+prohibition+of+child+marriage+act+pdf PDF link annotation
    • https://jamiwimavebu.weebly.com/uploads/1/3/1/4/131453695/9396807.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/vovalikam.pdfIn PDF document text
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/27a0d04.pdfIn PDF document text
    • https://roralolew.weebly.com/uploads/1/3/0/7/130775143/2ece73a29a909.pdfIn PDF document text
    • https://raligeledow.weebly.com/uploads/1/3/4/8/134893256/740d3b218e.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/bClTgdz/pocket_veto_definition_ap_gov.pdfIn PDF document text
    • https://cdn.sqhk.co/danopefasuf/gxiaeii/lozadorev.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/jjNia0G/81055602355.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/2007_mazda_cx_7_alternator_replacement.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/zopiritekapuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_ad4378996a7c4dc5986ec664c067fff7.pdf?index=trueIn PDF document text
    • http://gonegexunu.myartsonline.com/fl_studio_12_tutorial_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b89c94a-f6dc-418f-894a-f70b6984b522/14537878967.pdfIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_1a73079b2565453f9aa5642cc11a69f1.pdf?index=trueIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_a1e8e209acc54969b97739b4443385f4.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_cc700c930e814b4394e3d3c173db4f45.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3954a539-e8f6-495e-a28b-13e1da41d173/similar_triangles_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6630735-2137-4929-a825-78b698b11c2a/samsung_rsg257aars_ice_maker_removal.pdfIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_e4ffb6d44d954c8c9f4c595b6adcc78b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c81b2a7-2c68-43c9-b828-1ea8217a87de/can_you_start_a_paragraph_with_a_quote_in_apa_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf090396-f9b6-416d-8b87-efb6b8de2c11/where_can_i_find_the_game_left_right_center.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b93717f-b52f-4aca-81b9-5186f44c8817/preparing_for_social_work_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b70c29-d097-4770-9922-7d14b1d201a9/22390517079.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_off000100f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F2 5480 bytes
SHA-256: 3dfd6b88470d77574653da52d676eb9de53b610a2887672e6f637e2bb80ab2a9
font_01_sfnt_off0001135f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135F 10432 bytes
SHA-256: c8e2a01d9f42ee24164a02e82a09d564beff129221241b22185fc7cf056c49ae