Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5b4838ea363cda…

MALICIOUS

PDF

75.2 KB Created: 2021-03-20 23:08:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 48a643974924e0e93ca5ce7f603c7ed0 SHA-1: 9bd8f2f336048d35026bb82cd17fa6d194e2e090 SHA-256: aa5b4838ea363cda99886c095ed3fd20d4f3fba0da52a9307f31a52e37418019
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically identified as a potential phishing or malware distribution point. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'reading comprehension lessons 2nd grade' and metadata from 'wkhtmltopdf', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=reading+comprehension+lessons+2nd+grade PDF link annotation
    • http://1xbet-registr.site/443200379593idku.pdfIn PDF document text
    • http://online-sistem.site/what_is_canon_in_art_historyno7wt.pdfIn PDF document text
    • http://ukranews.site/swimlane_process_map_templateliec6.pdfIn PDF document text
    • https://sunarikibuniteg.weebly.com/uploads/1/3/1/3/131381519/daa39021b52b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_604b69ed3ec46.pdfIn PDF document text
    • http://hamsterbig.com/living_flesh_door_grim_dawnbv1ei.pdfIn PDF document text
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/d290c51e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457586/normal_5fef6ab66935f.pdfIn PDF document text
    • https://zugipevewepa.weebly.com/uploads/1/3/1/4/131483317/03ebc7f.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/ja8ihef/bezulevedagivifiwesonasa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_603442fac1725.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/gfihhju/32562063552.pdfIn PDF document text
    • https://cdn.sqhk.co/gumakulex/gMjdJjz/baker_business_3_premium.pdfIn PDF document text
    • http://yourdesk.website/jezogetafubasapvj9xz.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/peds_response_form_in_portuguese.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/nY5ghie/forward_assault_remix_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wekapalipewux.epizy.com/58113698910.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/why_does_my_sunbeam_heating_pad_blinking.pdfIn PDF document text
    • http://kepatoxa.epizy.com/50455793266.pdfIn PDF document text
    • http://gowegonuma.epizy.com/zosoxogikurejofaxatukegil.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/turebolulifozusibi.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_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 5624 bytes
SHA-256: dc4f7abc7de73b69613b2d60372c96a040d6bdaad709f482f522be8f9dc5a50f
font_01_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 10144 bytes
SHA-256: b5c432e1bbdf9312b05a9ba93b021bdc37ec68b2e391165c7ce53315a3b6dbea

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