Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a64913d042ece11…

MALICIOUS

PDF

76.5 KB Created: 2021-05-14 19:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d5cfe1bdcd1978d3dd8a6132ff63a683 SHA-1: 526c2723d941af9fa1567c554c0178a4c13ab494 SHA-256: 2a64913d042ece11178cef767fe19fb1abf82e03d1341617f1f05863be2aee6c
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 0.9997

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://kuzutuzo.ru/strik?utm_term=para+que+sirve+la+vitamina+d+1000+ui PDF link annotation
    • http://kakafeg.scienceontheweb.net/45172441397.pdfIn PDF document text
    • https://cdn.sqhk.co/rifibimilo/gggFrYg/wivukumuresudimotugivade.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/55456512635xgb75.pdfIn PDF document text
    • http://table-wait.com/jipexula8k5mw.pdfIn PDF document text
    • http://philonio.online/interpretation_of_abg_reportd87oz.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/banking_awareness_for_rrb_po_mains.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/how_to_make_a_bridge_with_popsicle_sticks_without_glue.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/pidegude.pdfIn PDF document text
    • http://koreanluxe.com/lord_of_chaos_wheel_of_time_quotesf983a.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/njhDJii/chocolate_chip_cookie_recipe_without_eggs_and_milk.pdfIn PDF document text
    • https://cdn.sqhk.co/fefuxumito/NiaQsjd/one_news_now_covid.pdfIn PDF document text
    • http://tatuxuvoziparu.mywebcommunity.org/how_to_get_rid_of_ground_ivy_glechoma_hederacea.pdfIn PDF document text
    • http://shothard.site/lakijazawiguzidaqrz0s.pdfIn PDF document text
    • http://pipavinekiga.mywebcommunity.org/vumogurosobitezimikalov.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/basic_electrical_and_electronics_engineering_interview_questions.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/kitakilesa/rotujajelopiruraju.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/nusojidunariginifati.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/rheem_gas_furnace_prices.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/an_invitation_to_health_dianne_hales.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/29533628108.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_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 5352 bytes
SHA-256: 7824ddee92060d32f638b2d8aaacbe62891fd5eb76e16fc2e68a867bce5d0165
font_01_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 13016 bytes
SHA-256: a625fb083fc33510a533b7836ce61b1192878c720b5c50b767635110d1a77afb

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