Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8eb036c3e76983b…

MALICIOUS

PDF

72.8 KB Created: 2021-03-17 03:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f68b57790e731d6988e5e629ad89a28a SHA-1: 9eb648be2ec11ccbb276e80c2803bd597889e762 SHA-256: f8eb036c3e76983b498c5ffd0e331b974b9fbc06e60c03b758e0b1d721388b70
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 0.9998

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://jacksth.ru/award?keyword=ammeter+voltmeter+wattmeter+pdf PDF link annotation
    • https://sobidoduwipiver.weebly.com/uploads/1/3/1/4/131406433/guwojimijedo_sikixafumoz_kobukudali.pdfIn PDF document text
    • https://cdn.sqhk.co/soboxuxafiso/egfzGhf/98972358560.pdfIn PDF document text
    • http://tetiviguxawik.getenjoyment.net/an_introduction_to_language_10th_edition_answer_key_chapter_2.pdfIn PDF document text
    • http://kapijozorok.22web.org/tasax.pdfIn PDF document text
    • https://zagemixawidi.weebly.com/uploads/1/3/1/3/131378918/fexoniv.pdfIn PDF document text
    • https://cdn.sqhk.co/remimuroku/jh41DPY/rebuvowofud.pdfIn PDF document text
    • https://cdn.sqhk.co/dikarulik/jdqiBjf/87721258493.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/download_buku_akuntansi_keuangan_menengah.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/48807580866.pdfIn PDF document text
    • http://nexaware.epizy.com/blue_prism_developer_certification_dumps.pdfIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_c59c3a0d402844a99cdca5b653b8d046.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_1805c9cee9c14370b957e948b7113627.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/stihl_ms250c_price_australia.pdfIn PDF document text
    • http://zovogimobidel.rf.gd/88851799530.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/good_food_guide_vegan_recipes.pdfIn PDF document text
    • https://0404cab7-c021-4537-be79-420bcb2f88cc.filesusr.com/ugd/52c240_66a88ad6c3664710bf65106d4f050034.pdf?index=trueIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_22631746b428430597d5102a09e5432d.pdf?index=trueIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_fbc0ccf82e8149008ea84aa5f91e6032.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinadi/gulobifatipe.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_off0000e1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 5148 bytes
SHA-256: 92e648d915e8556ec1c7acbd646a772e63591e7cf01a590fed4298699c9f8e5a
font_01_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 10248 bytes
SHA-256: 1b84ea777a7ca98c693460f7232565cd7e15557700f4bbe2c7c70794cbbd47cd

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