Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a77ab11d93f796…

MALICIOUS

PDF

77.2 KB Created: 2021-03-14 11:20:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b5f887dee5ce0f3436b194b7593186b3 SHA-1: 1016bea9183e4ca5e0ed20a756fb56335ece62e3 SHA-256: 88a77ab11d93f79663099f63fb1be0244f47784c1a7991883dda67d775d5167f
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 0.9956

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://midufefew.ru/award?keyword=define+adolescent+pdf PDF link annotation
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/4302850.pdfIn PDF document text
    • https://delitulasuv.weebly.com/uploads/1/3/0/7/130775658/repik.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/33688323777669o3.pdfIn PDF document text
    • https://sefositudixe.weebly.com/uploads/1/3/4/5/134524400/fb8a4835.pdfIn PDF document text
    • http://kugaraginoja.mypressonline.com/29982166859.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/BQNihid/free_music_apps_without_wifi_needed.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/36367852031e75zp.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/sigOgjE/wild_west_escape_level_5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471083/normal_5fc6aaa56323d.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/what_to_do_if_you_fail_pre_employment_drug_test.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/56358.pdfIn PDF document text
    • http://jewlgems.com/woxopetinuwegetagete5ty6p.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/gf6idpZ/wow_sharpen_blade_mortal_strike_macro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500692/normal_5fd84301c4744.pdfIn PDF document text
    • https://cdn.sqhk.co/xaduwudixum/heighhI/bitajigobipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465386/normal_602fa0883d82f.pdfIn PDF document text
    • http://tehnopolis.org/how_do_i_descale_my_delonghi_primadonna_coffee_machineiv176.pdfIn PDF document text
    • http://skameyki.club/sia_chandelier_sheet_music_pianoqf88s.pdfIn PDF document text
    • https://cdn.sqhk.co/rixakowu/ngePUgg/28335976242.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5fdd30938bcc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407788/normal_60278d18a29fc.pdfIn PDF document text
    • http://wulutano.mywebcommunity.org/38670607395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vubelifijam.atwebpages.com/changing_fuel_filter_mercury_150_efi.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_099ff86b86154f7f8bcfdd1a2f01931b.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_dd168df55181424094eefdb7ce0b4cd0.pdf?index=trueIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_dd7e94029e684af2a9e446940ef56cb6.pdf?index=trueIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_37cf59a25e6d4f948a9498c2f3dbb6da.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_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 5052 bytes
SHA-256: 9e0cf0dc6ebd479069b4045c800b45821cabfee061a403617752ca82b2fe9723
font_01_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 10384 bytes
SHA-256: d707504454147bcdccf87510b71b1f59bb2dea62d3775aebebd1af3853ebf284