Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a907d8ce710d84…

MALICIOUS

PDF

83.4 KB Created: 2021-03-30 23:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7992397362b74b6d8f02ac2caf768c80 SHA-1: 6bd5b663dbcaef0fd38d3e38707cc27291a8335a SHA-256: 53a907d8ce710d8473010e90268128d53f69082c9a208297616eb4a20a76f6de
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 0.9993

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://xajibur.ru/123?utm_term=college+student+resume+template+for+internship PDF link annotation
    • http://talkme-news.info/how_to_comply_with_health_and_safety_at_work1xjvb.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/fje7ggg/kufamelajawezidor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490534/normal_6058253033e88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445879/normal_604d04b0659fa.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/jahajj6/20454951740.pdfIn PDF document text
    • https://cdn.sqhk.co/zibepidok/h8ghhg9/power_rangers_legacy_wars_street_fighter.pdfIn PDF document text
    • http://tanemazijafawin.medianewsonline.com/encyclopedia_britannica_color_full_download.pdfIn PDF document text
    • http://besemafobekilir.22web.org/reporter_newspaper_amharic_version.pdfIn PDF document text
    • http://neuroncraft.online/hollow_earth_expedition_rpg_reviewl41yh.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/calories_in_dunkin_donuts_irish_creme_coffee.pdfIn PDF document text
    • http://detonic-buy.website/bassinet_fitted_sheet_australiadt6t8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377371/normal_5fd06a4d60a48.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/muzodunese.pdfIn PDF document text
    • http://cleanup-sale.site/72656148266xpec5.pdfIn PDF document text
    • https://cdn.sqhk.co/rapekerokemo/29qfsjg/wexaga.pdfIn PDF document text
    • http://4escam-bot.online/aplikasi_vsco_fullpack_gratis_terbaruwm7pe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_8188f84ac89d4b7d9d3ea18f3d7f91fe.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_8e4a1d1a0b1a43899b2d61e0dfa9b71c.pdf?index=trueIn PDF document text
    • http://masuroti.rf.gd/fiperef.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_d3170f8633844c12bdb760457f35d078.pdf?index=trueIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_48166b11f410450a965202abc6623bab.pdf?index=trueIn PDF document text
    • http://vexabimumemig.atwebpages.com/what_is_the_best_workout_to_gain_strengthen_knees.pdfIn PDF document text
    • http://gubadif.myartsonline.com/34238346981.pdfIn PDF document text
    • http://madukavinoxonal.epizy.com/fawejanitudinama.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_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 5360 bytes
SHA-256: 6f69f56ecd18a17b817051f89de7723739975ef057bc4bdfc1b2e48419446076
font_01_sfnt_off00011ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA4 10664 bytes
SHA-256: 8cd80b7e8ed3ffc46fd90dea187f373188f6276d753ca3936bdf8189095eba08