Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b655b0043dac0d3…

MALICIOUS

PDF

86.6 KB Created: 2021-04-18 20:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bac4c3b53b5c935b48307db8eaae09df SHA-1: 588dec4f46b33bba76bee82c37e6021641934b16 SHA-256: 2b655b0043dac0d38dc11ef44c41c9b54341e6c79c31e8cd9a2146710943d7ed
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 0.9994

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://seumenha.ru/strik?utm_term=how+would+you+analyze+information+for+data+warehousing PDF link annotation
    • http://vetobiz.sportsontheweb.net/effect_of_drug_abuse.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/hehggi3/48670131460.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/QEhbhcH/finger_slayer_apk.pdfIn PDF document text
    • http://bogipeborowe.sportsontheweb.net/acet_exam_paper.pdfIn PDF document text
    • https://cdn.sqhk.co/saguregifu/hihiBhj/38378452556.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/exportacion_de_aguacate_hass_en_colombia.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/gnib2ib/nafigowidojel.pdfIn PDF document text
    • https://soxigirotum.weebly.com/uploads/1/3/0/9/130969819/nubed.pdfIn PDF document text
    • http://blacktea.space/gloomhaven_solo_scenario_itemslep9a.pdfIn PDF document text
    • https://juxapokidopelif.weebly.com/uploads/1/3/1/6/131606881/5438835.pdfIn PDF document text
    • https://wawokosekipazas.weebly.com/uploads/1/3/1/4/131452886/c036dd9f.pdfIn PDF document text
    • http://wifisef.medianewsonline.com/low_carb_keto_food_list_with_printable.pdfIn PDF document text
    • http://interstart.online/the_jungle_freevll17.pdfIn PDF document text
    • http://nurigoluda.mygamesonline.org/tawujufeduwex.pdfIn PDF document text
    • http://wijutomotagam.mypressonline.com/woxaxakuxowitudew.pdfIn PDF document text
    • http://metiwizonud.getenjoyment.net/vapekojodubexujopolomoner.pdfIn PDF document text
    • https://lakojelot.weebly.com/uploads/1/3/1/6/131637836/pimekunabule.pdfIn PDF document text
    • https://cdn.sqhk.co/xetajikok/oXRSjia/kub_puzzle_platformers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gajutar.onlinewebshop.net/zifusule.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/manual_de_pioneer_avh-270bt.pdfIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/gelajil.pdfIn PDF document text
    • http://mojozore.myartsonline.com/article_35a_in_marathi_download.pdfIn PDF document text
    • http://penanaras.myartsonline.com/honeywell_rpls730b_user_guide.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_off00011524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11524 5528 bytes
SHA-256: b4581fad049a06784ac83570004cc5e31bd414f7835096cb656b558cffcf11f5
font_01_sfnt_off000127e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E7 10804 bytes
SHA-256: cfd66b109375cc081964967af58955bc511875dcf30413a8e14dd006df20e336

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