Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb366f5395c1a13…

MALICIOUS

PDF

159.1 KB Created: 2021-03-21 03:56:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 038eb75d4026eb740ab0b12b851250cc SHA-1: 3b8c39fd27e140f9421410066c16a823760469d1 SHA-256: dbb366f5395c1a13daf537856a9c4c19d1e77bf9f088cdee52014456da3588e8
186 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the presence of multiple external URIs and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggest a multi-stage attack where the user is prompted to download and potentially decrypt a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://leonvi.ru/wix?keyword=whatsapp+plus+apk+2018 PDF link annotation
    • http://idealica-italiaufficiale.site/happily_ever_after_kiera_cass_synopsisydw23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_604ca60e08bec.pdfIn PDF document text
    • http://gaxenop.medianewsonline.com/dracula_de_bram_stoker_filme_netflix.pdfIn PDF document text
    • http://suwefazimim.medianewsonline.com/jeperujadelametivapidexi.pdfIn PDF document text
    • http://vitodibiwanezej.mypressonline.com/logitech_g710_software.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452199/normal_604fa5ed3f27b.pdfIn PDF document text
    • http://changely.club/fossil_q_explorist_gen_4_specificationsn6h7t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377128/normal_5ffb829a8104e.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/fuzzy_mathematics_project.pdfIn PDF document text
    • http://dreamingdeveloper.com/8716091694zz934.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/86195208383.pdfIn PDF document text
    • http://securespot.ru/3041510944267kdq.pdfIn PDF document text
    • http://nitesufi.sportsontheweb.net/lerif.pdfIn PDF document text
    • http://istlan.fun/924758093820it82.pdfIn PDF document text
    • http://deflecfcvy.best/73469735310m6jqs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://matewedidoxeber.onlinewebshop.net/do_ants_have_antennae.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_807d26aaf83c4ec6903be22e6a0ce695.pdf?index=trueIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_9b9032b55675437a91a75687e348e23b.pdf?index=trueIn PDF document text
    • http://rususekobijo.myartsonline.com/mosfet_differential_amplifier.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_68b5e7abe4a54b87a78f51bd3743a345.pdf?index=trueIn 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_off00022abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22ABD 5408 bytes
SHA-256: 68bf300ed23c31ae43519af6b9edd67d5b694f464d021820b89cacde4c9cb720
font_01_sfnt_off00023d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D2C 15168 bytes
SHA-256: 6d3d0b9912c3c74289e1bb2fffa8bdaa33557fa95167923a88fe9e9452242c68

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