Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa22ca33fc4158f8…

MALICIOUS

PDF

83.4 KB Created: 2021-04-28 22:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bbb39bef5890a69edde7986882cccd69 SHA-1: 77f11a5984b88510908e8bf69ee033cba4904a11 SHA-256: aa22ca33fc4158f8fb2099e2854e8bef7ef71e7962ec9b29aa48a7fba66473ba
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains, suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/strik?utm_term=what+to+look+for+on+final+walk+through+before+closing PDF link annotation
    • https://cdn.sqhk.co/wuluzajiroz/jNiakeJ/planetary_annihilation_legion_units.pdfIn PDF document text
    • http://saporik.scienceontheweb.net/11602062638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_601be652a434a.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/how_to_become_a_network_security_engineer_reddit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393018/normal_5ff773f92a1da.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/ijiNaQs/kilidifikopirorilolatom.pdfIn PDF document text
    • http://nutopul.22web.org/how_to_make_money_with_bitcoin_cash_app.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/bank_exams_reasoning_ability_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_601c78c001554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_6039c6c9aadc5.pdfIn PDF document text
    • http://jidokove.scienceontheweb.net/cisco_routing_and_switching_200_125.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/jhjiNjc/77251623828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499319/normal_5fda4b24505ef.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/Akhi7zA/watom.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/internal_combustion_engine_meaning_for_dummies.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/71307911219.pdfIn PDF document text
    • http://telisidaz.epizy.com/honda_trx_350_carburetor_adjustment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d67ae2d-4ba5-409d-a62f-731ae62661a6/36418781911.pdfIn PDF document text
    • http://polilofu.onlinewebshop.net/buku_bahaya_merokok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a44a5992-b59d-417a-bad8-05a523dc1e7d/69851136124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd9e3949-ffec-4075-8834-543cbb001e6f/definicion_doctrinal_de_los_titulos_de_credito.pdfIn PDF document text
    • http://lujebanamof.epizy.com/certificate_of_experience_prc.pdfIn PDF document text
    • http://kolitaguligod.epizy.com/where_to_buy_leg_vibration_machine.pdfIn PDF document text
    • http://zibelasavu.atwebpages.com/dapeji.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_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 5452 bytes
SHA-256: 926c76785f50de44fd7a602b22911cfe42592bb3e6823a362bca6f4386128295
font_01_sfnt_off00011922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11922 11280 bytes
SHA-256: ccb8c474114281490fd2088d8b4d32a3c3f7d4701ade57ed5cb3e342fbed4e94

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