Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d2647a0195e09e…

MALICIOUS

PDF

78.3 KB Created: 2021-03-31 03:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c000b4859da54607f224d6f9985c5b72 SHA-1: 8e348d3fbbdc81d3d43284eec05da6214a702216 SHA-256: 76d2647a0195e09ef8ff0cf3553b57d164315bfae4535e674ccb5ae1602b003f
186 Risk Score

Malware Insights

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

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 0.9997

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://vilenefex.ru/strik?utm_term=walmart+ma+black+friday+hours PDF link annotation
    • https://cdn.sqhk.co/lokojagivel/Dfu3rja/38057611900.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/4ie8EmS/galaxy_entertainer_9_digit_code.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/xhcICgc/34374124438.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/9265494207.pdfIn PDF document text
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/c4a0d144f9cf.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/kghhfB8/plants_vs_zombies_heroes_mac_download.pdfIn PDF document text
    • https://zirubelazuzo.weebly.com/uploads/1/3/4/7/134747961/8690342.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawomo/aCZghac/pokemon_game_or_tv_show_first.pdfIn PDF document text
    • http://tonevagewalilu.medianewsonline.com/16531884313.pdfIn PDF document text
    • http://korogesubelokut.mypressonline.com/48871377804.pdfIn PDF document text
    • https://cdn.sqhk.co/suxunuke/kmYfzJe/introduction_to_abstract_mathematics.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/ligoxak-sosurubuvararu-galekusijineb.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/arEEtxY/short_hairstyles_2019_black_female_over_60.pdfIn PDF document text
    • http://datulosuwila.iblogger.org/lutavagetafa.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/dzjeZRN/baby_grows_up_baby_alive_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/5Yw2jeW/angie_s_list_business_log_in.pdfIn PDF document text
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/nomumek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://natukifuza.atwebpages.com/oxford_bookworms_library_stage_2_huckleberry_finn.pdfIn PDF document text
    • http://vulafaxenoza.epizy.com/medical_billing_and_coding_for_dummies_2nd_edition.pdfIn PDF document text
    • http://fuvuxejuv.myartsonline.com/english_bible_king_james.pdfIn PDF document text
    • http://gokatajikimole.rf.gd/trends_in_supply_chain_management_2020.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_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 5580 bytes
SHA-256: f1f89a616d2ba821adc0a99dc0d0e28979622156bcd9011f276044a7156afdbf
font_01_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 11004 bytes
SHA-256: e8cd3ebab5c244ee8676bf98bb99150eece67b4299e31b349165d289eeaf7e14

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