Malicious PDF — malware analysis report

Static analysis result for SHA-256 5622e719582e1755…

MALICIOUS

PDF

69.4 KB Created: 2021-03-29 17:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d0f80fc91c3fe317ca20010b742952f8 SHA-1: 14008f5bc1d78982fbe03f68d639b3740cff3591 SHA-256: 5622e719582e17551200a2305e8a9e999c2457ab2edd3adc62afd5941d88a8c1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/123?utm_term=51+labels+per+sheet+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388842/normal_5fd912ed810cf.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/VKKSKLv/ice_cream_roll_machine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_602fa9174926f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_605d9348be55a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_603e7de42f666.pdfIn PDF document text
    • https://cdn.sqhk.co/rakapuvad/AgjEvyc/kuguwuwikidiz.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/ihrhbge/zatazovifebovigize.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/EChhbic/86311988639.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_e817864526be478a905db7a03ea7300c.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_87b4f13ed2ca43669c7ecdb332d10429.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e1607a-f3a8-450a-9be7-243388dd574e/vintage_guitar_price_guide_2018.pdfIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_8f70dc4a38b6485aa178c29e44e514d6.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_79d77cdf8ab34b33900a0e9670fb9f9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/144741b5-b0a4-4bf3-8d69-cf7c8917ff6d/72373289999.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/65472275429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/475c9e70-05b6-4198-9029-4c415f44ba42/78656840847.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/which_supply_chain_certification_is_best_in_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/how_do_i_reset_my_innovo_thermometer.pdfIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_9f5d327ab914433681766fce57240a35.pdf?index=trueIn PDF document text
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_d378ccc118474608b76135337ca16384.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/fight_list_answers_synonyms_for_boss.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/25460471332.pdfIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_de23fc511623459ea72dba56622c0d8d.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_453437a583ed418b8610e33f7149fc3c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/789f3ec0-b675-4088-85be-7514890cde70/how_to_update_garmin_astro_430.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_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 5280 bytes
SHA-256: e563dc02781f2a311deb035dab72e88187ac350ae55068c4f4df36fed3d22860
font_01_sfnt_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 10392 bytes
SHA-256: 4cf4a33efa11e1fc2232928dd6c92b75387c348b517d904faa20fba77fc918ee