Malicious PDF — malware analysis report

Static analysis result for SHA-256 807551bd83087ffd…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 23:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3d739257b4bd0b2b2fcecfb932af4d2 SHA-1: e6daaa73e90144a3ab473e649bd56923d4ce9033 SHA-256: 807551bd83087ffd23fe020b55ebe94dbdf3ea36eee992963c6e896eda37c2ee
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by an ML classifier as malicious and contains numerous embedded URLs, many pointing to potentially disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of creating a large number of links on distinct, potentially low-reputation hosts. While no scripts were extracted, the structure suggests an attempt to lure users to external sites, possibly for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 4

  • 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 http://www.motionmantra.com/userfiles/files/rubebodovuxiratonama.pdf In PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b7004826e7feb6a5e0f8c5037bb57018/69648005055.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/niluvopev.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/luniraxekibobizaginejiri.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/9955537478.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210905_F79283D0D7188342.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/160109309147.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613624095c220---noxakelovanikadelejomaja.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/87858141747.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/xejibinumubusodusi.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/vimasetumaz.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/13149447684.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/dabirabizekaboxajivog.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/90209120502.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/67468277019.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/84502589853.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/zuzikabuso.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/vugijibirejufezapefi.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/24730563326.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/dipevuronapukefonotis.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/fotevisojanofafiboba.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/filerapapawu.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/megagemufakeroxaro.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/23771586570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=good+hentai+mobile+gamesPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 18460 bytes
SHA-256: 4f33635548776d9ab0a440498de0c52177111f1b70ca96086990608199c12801
font_01_sfnt_off00011b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B81 10776 bytes
SHA-256: 06b57a6aa97fc6a7e961aa20382f98f823d2115d5b6fe967a006657759bf6553
font_02_sfnt_off000133ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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