Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f81b91c330472a…

MALICIOUS

PDF

77.5 KB Created: 2021-04-04 16:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dfbd487324e9c082f53cdf852de1e8ed SHA-1: 74f9b576eb1fbaa9695094729534e8543b276324 SHA-256: 91f81b91c330472a9d0a30ddeee8ed29bb88d5106504d953bffe89723a858de2
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/award?keyword=kgmu+bsc+nursing+entrance+exam+previous+year+question+papers+pdf PDF link annotation
    • http://usmileofficial.site/saroxat4461z.pdfIn PDF document text
    • https://cdn.sqhk.co/jizapamilizo/7iiU81k/veera_serial_star_plus_song.pdfIn PDF document text
    • http://wedurorokim.mypressonline.com/kotefomopugif.pdfIn PDF document text
    • http://misifebofol.mywebcommunity.org/bipejed.pdfIn PDF document text
    • https://cdn.sqhk.co/tikugosedik/jehmrid/athletic_apparel_wholesale_distributors.pdfIn PDF document text
    • http://car-test.pro/blackmail_patola_dj_songj3wad.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/wuXiadn/spelling_and_grammar_check_not_working_on_word.pdfIn PDF document text
    • http://witaxolexigabi.mywebcommunity.org/dejutobemazij.pdfIn PDF document text
    • http://arendagg.xyz/whirlpool_water_cooler_not_cooling7sf4f.pdfIn PDF document text
    • http://eushopvmn.site/basic_hindi_letters_in_tamilr265t.pdfIn PDF document text
    • http://dijuvilojo.22web.org/remote_answering_service_jobs_from_home.pdfIn PDF document text
    • http://redirunna.xyz/molozitanarumerizegozirazroyr.pdfIn PDF document text
    • http://kivafijap.mywebcommunity.org/archimedes_law.pdfIn PDF document text
    • https://cdn.sqhk.co/jesuzedavoti/WibXyhF/fodozotefapugex.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/nnQ63if/fizaxelivotorop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/wuwamazumezu.pdfIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_9f25f7d8d8bf4110a0f3ada38cf900e0.pdf?index=trueIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_36c1465fc361465a85d69d7dd48c6db5.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_8217c2574c5444639c85fbadc34d0fe6.pdf?index=trueIn PDF document text
    • http://sajulugebimisu.myartsonline.com/13414146746.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_479f698f951748afbdd0eecc7ff5e819.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toguvaju/dont_worry_song_mr_jatt.pdfIn PDF document text
    • http://wafubarig.epizy.com/43021008158.pdfIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_f10d5eb8a2bd4e79a1943fd2e5f2187a.pdf?index=trueIn PDF document text
    • http://favavobebin.epizy.com/rexepobumiginev.pdfIn PDF document text
    • http://bawozejowavonot.rf.gd/roxuxofub.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_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 5908 bytes
SHA-256: 9b084fdcca1c70827257f59308b0e76ad30ec1d0f92ed67981a36d151167c2a9
font_01_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 10352 bytes
SHA-256: ae910b04247c3c8a4049a91c336bcaf27eff41bf7079273e1c63d10e394bc687

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