Malicious PDF — malware analysis report

Static analysis result for SHA-256 1867dbb61d4c4ad6…

MALICIOUS

PDF

76.0 KB Created: 2021-03-09 19:22:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 39d1facc5841e650ecc51a14b84cbb9c SHA-1: d4811baf35f0c7de7aa27e540d21860077943c69 SHA-256: 1867dbb61d4c4ad6fa4d2e1c38e32414abad39383da05b2b05f18404e6a0733a
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or redirector document. It contains a large number of embedded URLs pointing to various domains, many of which appear to be part of a link farm or disposable hosting. The primary malicious activity observed is the extensive use of redirector links, likely to obscure the final destination or to engage in SEO manipulation. No scripts were extracted, but the presence of numerous external links suggests a phishing or content-serving intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=liters+to+ml+worksheets In PDF document text
    • http://vabuletarikinil.iblogger.org/3275148340.pdfIn PDF document text
    • https://lujotasapamuxa.weebly.com/uploads/1/3/0/9/130969194/6041284.pdfIn PDF document text
    • http://creditreportus.info/maytag_bravos_quiet_series_300_dryer_sizet2pgd.pdfIn PDF document text
    • http://fsfsfd.xyz/monster_defense_tower_defense_games_free_download2aijc.pdfIn PDF document text
    • http://xovasaf.iblogger.org/beauty_logo_design_template_vector.pdfIn PDF document text
    • https://pameduvexeligim.weebly.com/uploads/1/3/4/5/134579292/5122228.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/cjayIVo/desarolezome.pdfIn PDF document text
    • http://jopazenes.iblogger.org/ruger_wrangler_owners_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/nCVjicu/monijovolonabajifipokiruv.pdfIn PDF document text
    • http://vizit.store/how_to_create_custom_login_form_in_wordpress_without_plugingsk6v.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/bZjjXhd/92413877095.pdfIn PDF document text
    • http://idealica-italiaoficial.site/meal_plans_tamuccl38p2.pdfIn PDF document text
    • https://gabavogafev.weebly.com/uploads/1/3/4/0/134000006/8181412.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/1hihd6y/15462015122.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/MtgjQhj/fefaj.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/WhfhhO7/movie_collection_organizer.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/5e4567ab0.pdfIn PDF document text
    • https://cdn.sqhk.co/gijimexuv/uHggHi0/pavotigow.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/2503445.pdfIn PDF document text
    • http://openlait.pro/tree_of_life_bible_accuracyc8esg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nijuxejo.epizy.com/python_list_map_function.pdfIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_2f1634e74c784612a0039ad37d393f64.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_7410051cc64e433d828b79e553ec957c.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_183f7420beda4bd8ae3b75f632e52e42.pdf?index=trueIn PDF document text
    • http://fudewalazakukug.epizy.com/faleguninurepotajajexa.pdfIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_cbedd01c70b74db6bbba262086e6b332.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 4812 bytes
SHA-256: c31d5c6d04bfdee9aed9f0d99aad052f0e99ac277348eeec6739328b912fefaf
font_01_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 10744 bytes
SHA-256: 4bcadd9f9fe01a3e442e86f3c0100ef1b239c8bb7ce8d36e1801bfcf77958116

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