Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d9d76f1a2ee8b5…

MALICIOUS

PDF

83.7 KB Created: 2021-03-31 17:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 28ae441994d5ddb2cd8cfa8802f1aef2 SHA-1: 9b2b6e91e149c36d9373daa42a6ccce0c6cdb463 SHA-256: b6d9d76f1a2ee8b559a8e0ae8009dfabec802bf18f1e67a0e57a1399b484e1b0
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 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=bernard+shaw+plays+pdf PDF link annotation
    • http://rosutob.getenjoyment.net/my_beloved_world_book_discussion_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/2hhCzih/99790720963.pdfIn PDF document text
    • http://manibupefif.mypressonline.com/10_medicinal_plants_and_their_uses.pdfIn PDF document text
    • https://cdn.sqhk.co/biwizalibe/ejiigje/sulovizesokasepuwar.pdfIn PDF document text
    • https://cdn.sqhk.co/linerutinew/vcjhhgg/domovo.pdfIn PDF document text
    • http://mopowataxix.medianewsonline.com/berio_sequenza_flute.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/jilumibarufejawuforasemo.pdfIn PDF document text
    • https://cdn.sqhk.co/nazujovo/hcYhhac/football_referee_shirt_colour.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/hcOaT01/11873352994.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/sopakeguvimexakun.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/starting_my_pressure_washer.pdfIn PDF document text
    • http://bajoreto.sportsontheweb.net/10th_new_book_english.pdfIn PDF document text
    • http://dizofuses.mypressonline.com/act_practice_test_free.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/jaxonekef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_55307696f6874f6aa3f0cadccee16113.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/18364909231.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/kaba_locks_manual_l1000.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/sean_paul_trumpets_mp4.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_6f2d2bb351594dfb99ea1bf293ff0ba1.pdf?index=trueIn PDF document text
    • http://davinawoguzag.atwebpages.com/alcohol_intoxication_management.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/22282606121.pdfIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_b72d6c3661bb467e9f04a2091c77425e.pdf?index=trueIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_3ff3ef7aa84a4d08a707bf7953748714.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fokapikow/lokamepupakemavovona.pdfIn PDF document text
    • http://dubanexotokegel.myartsonline.com/39649906241.pdfIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/burejamavivepojowu.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_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 5372 bytes
SHA-256: da37df28e952cfc2808fcb3f2e868106976e46242b94bfe83ac4f73c2c49fde5
font_01_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 10772 bytes
SHA-256: 270c9eeb1d6d8e2d81e6c0df284e11c8b935edb768a41637bb444d298975a33b

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