Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc84ad59b6b7f79d…

MALICIOUS

PDF

73.1 KB Created: 2021-06-07 20:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d7ade9b70f1410ec0a5ece551a10b58 SHA-1: 55fa560926cdff6ce3485ccfd80a58fac13405a8 SHA-256: bc84ad59b6b7f79d372566cb56223376a0beecf1013514c3324b61cb53f18d72
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary external URL points to a resource that appears to be related to 'wordly wise 3000 book 8 answer key free', suggesting a lure to attract users seeking specific content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware through the linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/pbw?utm_term=wordly+wise+3000+book+8+answer+key+free
    • https://siganubamisibu.weebly.com/uploads/1/3/4/1/134108806/tesivagit_muwibem_manise.pdf
    • https://bapijinujaf.weebly.com/uploads/1/3/4/7/134700097/nevilo.pdf
    • https://fiwisiroveton.weebly.com/uploads/1/3/4/3/134339953/wuriwivawufanuraw.pdf
    • https://zevefexa.weebly.com/uploads/1/3/4/7/134727867/gedojud.pdf
    • https://nubesojobe.weebly.com/uploads/1/3/1/3/131398221/2183153.pdf
    • https://zogabimokesowu.weebly.com/uploads/1/3/6/0/136082780/8a865f568.pdf
    • https://gegotebure.weebly.com/uploads/1/3/1/6/131606057/velove_rolarotobu_rozusizuvewujix_mober.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/41a7826f-67a0-40d8-8d5d-a9a91b3eeb74/48279662165.pdf
    • http://famukaser.pbworks.com/w/file/fetch/144583188/destination_a2_grammar_and_vocabulary.pdf
    • http://fagimox.pbworks.com/w/file/fetch/144512826/pronombres_posesivos_en_frances.pdf
    • https://uploads.strikinglycdn.com/files/46759482-1233-4ee1-920e-852e2787b2e6/zamulaz.pdf
    • https://uploads.strikinglycdn.com/files/18da26e0-724a-4867-8e8b-3efa285cdd29/char_broil_3_burner_infrared_grill_lowes.pdf
    • http://jutifakukap.pbworks.com/f/welopugoveditegexupejolub.pdf
    • http://duriwug.pbworks.com/f/manual_de_oratoria_salvador_munguia_gratis.pdf
    • http://wejojixi.pbworks.com/w/file/fetch/144424371/solving_quadratic_equations_practice_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/2e16b53d-253a-438a-992f-cf893576e3cb/ekadantaya_vakratundaya_dj_song_in_telugu_free_download.pdf
    • http://nigezid.pbworks.com/f/how_to_fill_ds-160_form._step_by_step_instructions_easy.pdf
    • http://lekipirunezi.pbworks.com/f/nikosox.pdf
    • http://sekodegaxex.pbworks.com/w/file/fetch/144679659/27946235681.pdf
    • http://xodelow.pbworks.com/w/file/fetch/144588774/transformation_geometry_slideshare.pdf
    • https://uploads.strikinglycdn.com/files/b393b1aa-e951-4991-ab9a-03cc3b247452/where_is_the_spark_plug_on_a_husqvarna_push_mower.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df34.bin
bea8629a6500850ab4c53f88e35b470d0f16ca4b2528903b22cb441c30777d10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 5812 bytes
font_01_sfnt_off0000f327.bin
fdc3140e7d8f465e260065e9a2056836c97eb1b6a95cd1b4fe870454087961f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 10520 bytes

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