Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4436aa5018c7657…

MALICIOUS

PDF

108.1 KB Created: 2021-03-15 09:32:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1db3338ee5754c6dc1ff61e62a0f6b88 SHA-1: 45ba70f0af94796ff26ac568e23a39904296713d SHA-256: f4436aa5018c765722420ae97c542a27379a98fc88eb3e0b9900c330d9d588de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to potentially malicious sites. The PDF's structure and embedded links indicate a phishing or malware distribution lure, likely leveraging the 'the balkan wars pdf' keyword to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/award?keyword=the+balkan+wars+pdf PDF link annotation
    • http://zebiripu.mygamesonline.org/55971498893.pdfIn PDF document text
    • http://creditchecktotal.info/noneraraj6g2vw.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/gorufid.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/hFgfuhh/fewiluv.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/john_stuart_mill_utilitarianism_summary.pdfIn PDF document text
    • http://zedateve.mypressonline.com/niluvuraru.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/volej.pdfIn PDF document text
    • https://cdn.sqhk.co/meradipuwiz/sYWOgjl/90290869475.pdfIn PDF document text
    • http://antonioita.fun/gojoninaluposashee6l.pdfIn PDF document text
    • http://dupuladusudired.mypressonline.com/the_alienist_book_vs_show.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/what_is_another_word_for_365_days.pdfIn PDF document text
    • http://vezerfa.xyz/spd_20_roland_pad_pricet7zni.pdfIn PDF document text
    • http://gogogoinst.xyz/descripcion_de_reaccion_quimica_de_combustion_del_gas_butanoy1vxd.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/heJgfid/financial_accounting_and_reporting_for_deferred_taxes.pdfIn PDF document text
    • http://creditreportus.info/12027188120mi6se.pdfIn PDF document text
    • http://verification-help.business/pokemon_ultra_sun_and_moon_how_to_change_thundurus_formgj9dy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b2f56a-437f-488a-aa08-d2ecb50062b1/what_to_buy_your_godson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/861416ee-bb6e-4a06-bebe-c6052fa54f19/jinokem.pdfIn PDF document text
    • http://pexirud.onlinewebshop.net/mearsheimer_tragedy_of_great_power_politics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0296c7-ab56-4114-9bf1-829eb18ed02a/best_uses_of_true_polymorph.pdfIn PDF document text
    • http://tuxabatadifu.onlinewebshop.net/bipezerevetevipofes.pdfIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/stihl_cordless_weed_eater_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6690e013-247c-488c-802f-212965e1fc37/family_photoshoot_studio_near_me.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_off00016aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA2 5372 bytes
SHA-256: 8173ba4e9b9e2dbe813808fec857ba57fe001a4366281126741c5c9b73e1af41
font_01_sfnt_off00017ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CED 11604 bytes
SHA-256: 49266c50b2189fabe1f03c793f29f6fd96d0a9d3a60de89c179e06a41a513a44

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