Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e87f3d340b08c8f…

MALICIOUS

PDF

95.8 KB Created: 2021-03-09 15:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 89a5c83f41c4282ba3c5978a917cc692 SHA-1: 18ed407fabc6713b37431c58235145388b627cdd SHA-256: 8e87f3d340b08c8f334b22fbb0d58109db598a908921a6645eeb97b04e59ff83
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or hosting malware. The embedded URLs and the structure of the PDF point towards an attempt to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/123?utm_term=weather+report+black+market+discogs PDF link annotation
    • https://tabodixab.weebly.com/uploads/1/3/4/5/134585887/e65cf.pdfIn PDF document text
    • http://biweekamnf.com/block_game_drawing_physics_puzzle_dots_for_brainstormingjjvmq.pdfIn PDF document text
    • https://vujezogovi.weebly.com/uploads/1/3/5/3/135348950/rabuvenuke-rotikenev-tisamuroko.pdfIn PDF document text
    • http://curvepreloved.com/mitosis_coloring_activity_answers3a13k.pdfIn PDF document text
    • http://unreguezff.rest/ejercicios_palabras_agudas_llanas_y_esdrjulas_4o_primaria4owtf.pdfIn PDF document text
    • https://zoxukumej.weebly.com/uploads/1/3/4/3/134327216/rofarasi-dajawawusom.pdfIn PDF document text
    • http://electrumwallet.buzz/duxewitujisolokujo4n2c.pdfIn PDF document text
    • https://redikuvemezu.weebly.com/uploads/1/3/4/8/134872152/jolewupakik.pdfIn PDF document text
    • https://cdn.sqhk.co/labojime/cCPhjdz/turkey_drama_ringtones_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/wpujfhf/kidz_bop_live_2020_tickets.pdfIn PDF document text
    • http://bionatur.space/english_learning_center_byu4zxw8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://futikuzita.onlinewebshop.net/45981713503.pdfIn PDF document text
    • https://bbf54ad7-a439-4a61-8652-ed7dbce90670.filesusr.com/ugd/f34823_19774d6129764a2893bc8f1cff97073e.pdf?index=trueIn PDF document text
    • https://041f977c-1598-48cb-b578-3d63f550c8ab.filesusr.com/ugd/524ae3_f819e90ad60f4f1dad05edb570fa286e.pdf?index=trueIn PDF document text
    • http://nejimafalun.onlinewebshop.net/17933820555.pdfIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_62b7cb1fe9aa454dacf91227e1dbd529.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12073 5704 bytes
SHA-256: 72b0d07b1b33714aa8f910db57e294ab9ab84b002967a000dd1d24bd46984cbb
font_01_sfnt_off000133b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B7 12544 bytes
SHA-256: 91895f81e3b4eba1d1b26a2621b4b10f29844735d36547aad5968b6b994bdee4
font_02_sfnt_off00015cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD4 16120 bytes
SHA-256: 184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832

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