Malicious PDF — malware analysis report

Static analysis result for SHA-256 480e3b51f6cde618…

MALICIOUS

PDF

103.4 KB Created: 2021-04-09 04:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e5f9e0aca2c695a291d6203d8b5877c3 SHA-1: 79cce195efc659881c53dc8930eedb36d27cc2e0 SHA-256: 480e3b51f6cde61814ae88df05b37911ab6cbc8139f3e979f52b783bc03fdeac
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to known malicious redirectors or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though obfuscated, contains text related to 'best strategy for capsim', suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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 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/strik?utm_term=best+strategy+for+capsim In PDF document text
    • http://probkin34.xyz/mirobubezakawojuvomoke99rvz.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/nvXhbid/keepcalling_best_international_calling_rates_without_plan.pdfIn PDF document text
    • http://zarabotok.space/tofazasogamizenagesujudopmc5c.pdfIn PDF document text
    • http://appletopshop.ru/tabela_de_preos_de_carros_populares1x1gb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494883/normal_602448935145a.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/hdVihbu/61013760575.pdfIn PDF document text
    • http://casser.xyz/dekigonopuwafinopenito81o67.pdfIn PDF document text
    • http://kihepc.xyz/795218114332o4s0.pdfIn PDF document text
    • https://cdn.sqhk.co/pamavunawi/gidbkjd/lightly_row_viola_sheet_music.pdfIn PDF document text
    • http://makeyourself.xyz/speedy_cash_loanuzp4e.pdfIn PDF document text
    • http://alphabitx.com/zogefijulovakabjsi0b.pdfIn PDF document text
    • http://kvyovk.xyz/pharmacy_sig_codes_quiz5teeq.pdfIn PDF document text
    • http://copyrightreports.com/724428612550k7c.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/gfyXNpz/tavajat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487194/normal_6033bd0cc65cf.pdfIn PDF document text
    • http://easylearning.space/wawosisukekujeripawisozolgl6pp.pdfIn PDF document text
    • http://hookup154.space/79564073658ej3q3.pdfIn PDF document text
    • http://hydra.moscow/shreya_ghoshal_songs_2019_downloadcbq6t.pdfIn PDF document text
    • http://znakomstva69.space/crossword_mysteries_abracadaver8cgf6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/genedesowul/beed_reporter_news_today.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/trace_caller_location.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/ikea_twin_platform_bed_with_drawers.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/star_trek_william_shatner_cast.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FA 5136 bytes
SHA-256: 47f2583aad652a5412299f014c0c9e2f37452322232c2f14ac6ea6aadbb7f7b3
font_01_sfnt_off00015787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15787 12144 bytes
SHA-256: 1b7e52252b4880b008efd4b09473487788fba9ed89f746264f56499edf9d7778
font_02_sfnt_off0001808d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1808D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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