Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7d12be53faebc9…

MALICIOUS

PDF

77.1 KB Created: 2021-03-31 11:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e1ea689f40ff3a24c50ef08a9f0e2605 SHA-1: 9987a7ddbe6962f0ccca43a9ea9fcd8e9c95dd59 SHA-256: 5f7d12be53faebc9b46afb5122686d80d8df918687902bccdf6521185564cb2c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a specific vocabulary lesson, likely a lure to disguise the malicious redirection.

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://gimoguvi.ru/strik?utm_term=mcgraw+hill+wonders+grade+4+vocabulary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414339/normal_5ff35e568199b.pdfIn PDF document text
    • http://lifeit.pro/zilikonuzoburewubble.pdfIn PDF document text
    • http://jitutirujemi.22web.org/65003943898.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/hrMY2Vu/impossible_burger_near_me_restaurants.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470972/normal_5ffc37c89cc32.pdfIn PDF document text
    • http://reduslimitaly-official.website/hotel_housekeeping_checklist_formatrgzbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491925/normal_60067254e3f1e.pdfIn PDF document text
    • http://myyshooop227.site/maze_machina_gameh5bnf.pdfIn PDF document text
    • http://a1metromovers.com/how_to_become_a_caregiver_for_a_disabled_person2oi7p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462974/normal_601b8fe5829b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426413/normal_600bc6440f7e8.pdfIn PDF document text
    • http://biotringel.shop/momasemelesowajefunigilajhk8s.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/cahePgh/xejudavekavitajamusa.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/gcnpehj/gawimamunesu.pdfIn PDF document text
    • http://italia-doc.space/92544160449349qz.pdfIn PDF document text
    • http://christinaanddavid2019.com/paulo_coelho_love_quotes_weddingwzol0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413977/normal_60270f8e21751.pdfIn PDF document text
    • https://cdn.sqhk.co/satasevubu/dP8Jlic/best_idle_city_builder.pdfIn PDF document text
    • http://dirtygirl.fun/bolel2j6y6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jepugati.epizy.com/36851836478.pdfIn PDF document text
    • http://vorasokipat.rf.gd/descargar_app_outlook_para_android_gratis.pdfIn PDF document text
    • http://jazojogebi.rf.gd/avadhoota_gita.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_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 5688 bytes
SHA-256: 3d9fa09eb97bddbd1601f2834ac1b0787ef9fe57aefc1eb477e691f80616943a
font_01_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 11284 bytes
SHA-256: 437d9b6690a096e5924ba6bed0268c1d83b5666525d2916a31500dfd66f47ccf

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