Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4fad67f40970ea…

MALICIOUS

PDF

82.1 KB Created: 2021-04-02 12:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d6423f83ab28f843ae82d0a506778ba0 SHA-1: 5c2dc367ade1f4d4b634f38976d61cbf13190a6f SHA-256: df4fad67f40970eaed06d8f39706ba642c7b6058be659b57fd363c2a1074f537
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9957

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
  • 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://jacksth.ru/123?utm_term=internal+meeting+request+email+template PDF link annotation
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://dezlice.ru/adding_integers_free_worksheetsfe9za.pdfIn PDF document text
    • http://mazisim.mywebcommunity.org/campana_de_gauss_estadistica.pdfIn PDF document text
    • http://mandarin-fruit.space/list_of_german_comparatives_and_superlatives3gig7.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/6553632.pdfIn PDF document text
    • http://xupokaxe.medianewsonline.com/41103930787.pdfIn PDF document text
    • http://medasosu.22web.org/vunijebodapibowusom.pdfIn PDF document text
    • http://axecheat5.xyz/buying_guide_macbookhknwu.pdfIn PDF document text
    • http://manidat.sportsontheweb.net/kixos.pdfIn PDF document text
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/senitow-nizumikigu.pdfIn PDF document text
    • http://disozire.mygamesonline.org/16774109047.pdfIn PDF document text
    • http://belplitka.ru/machine_learning_with_python_coursera_github3v9g4.pdfIn PDF document text
    • http://zupurowuzuxule.iblogger.org/wobibisaru.pdfIn PDF document text
    • http://xibomupazone.mypressonline.com/xofuluxotasijakigi.pdfIn PDF document text
    • https://nedamekiwuj.weebly.com/uploads/1/3/1/3/131379605/3525515.pdfIn PDF document text
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/wefaxetusubuj-lededafumo-genejobedison.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/kemivemamaxiv.pdfIn PDF document text
    • http://bapulesaj.mygamesonline.org/vemon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ropupifalapoges.atwebpages.com/rifufunen.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/34610991518.pdfIn PDF document text
    • http://pepiretivixu.epizy.com/merge_bmp_files_into.pdfIn PDF document text
    • http://rufazigivemebod.rf.gd/tinker_tailor_soldier_spy_book_free.pdfIn PDF document text
    • http://goxafebo.myartsonline.com/71369420249.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/75749260826.pdfIn PDF document text
    • http://nirunad.epizy.com/158749746.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/93915498621.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/96842840428.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_off00010282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 5204 bytes
SHA-256: a16a2ee702a514f95922468619f639c9e2c1ab10c910618d2be970e2298e9523
font_01_sfnt_off0001141c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141C 10664 bytes
SHA-256: 0b9a1e27155a4893084682ff735af3715805e3e1c7da1fd217f0aeba4c8b877a

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