Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4747936cf8c9323…

MALICIOUS

PDF

79.7 KB Created: 2021-03-29 21:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0c53603d4d295c38e28489ead1f8121b SHA-1: baf21f1ac57aeae9d6d7f4acec17488b9e74fae7 SHA-256: a4747936cf8c93237cc0d9c1364136b03a83aab85b424a480fa18f0074961717
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to 'Freightliner coronado radio antenna' and application metadata, likely serving as a lure to disguise the malicious intent. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/aws?utm_term=freightliner+coronado+radio+antenna PDF link annotation
    • https://cdn.sqhk.co/konajera/qizBiiK/53982893167.pdfIn PDF document text
    • http://erse.xyz/96277264904173ie.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/U1LxMg5/food_high_in_vitamin_d_list.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/how_to_breathe_when_doing_kegels.pdfIn PDF document text
    • http://dopogabijup.mywebcommunity.org/adeptus_mechanicus_codex_chomikuj.pdfIn PDF document text
    • https://cdn.sqhk.co/kogexuwalu/gfhhGgh/interface_definition_document_template.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/rjZhegd/36878609647.pdfIn PDF document text
    • http://natiral.space/how_much_transmission_fluid_for_2002_honda_civic97nb7.pdfIn PDF document text
    • http://mokaxizekebade.scienceontheweb.net/55549771728.pdfIn PDF document text
    • http://zaduzoronogikex.22web.org/apple_to_zebra_video.pdfIn PDF document text
    • http://zurujavurobe.scienceontheweb.net/rokitikabanujugebomige.pdfIn PDF document text
    • http://italia-doc.space/alpha_oxidation_of_fatty_acidsjfk9f.pdfIn PDF document text
    • http://xitnet.fun/mugujofikutivirusjha1.pdfIn PDF document text
    • http://zdsshop.top/punurinokay6nvx.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/who_is_the_founder_of_mathematics_in_india.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef5cb46-bd15-4fcd-a4ec-be89dd470cb9/cuanto_tiempo_se_tarda_en_superar_una_ruptura_amorosa.pdfIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_99d8a8fb29a242f9a3d789f894f02bff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4303246-3acc-48d0-a2de-5fe0e403285b/how_to_do_transcendental_meditation_step_by_step.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_2714e9c9344e44cea20ec20a1e8cbe5d.pdf?index=trueIn PDF document text
    • http://zirururifikelo.epizy.com/vasijotigasugibuvuxom.pdfIn PDF document text
    • http://vewitemagim.rf.gd/83768447232.pdfIn PDF document text
    • http://ruguweronum.rf.gd/its_your_ship_audiobook_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25da9d56-50e2-4c01-b7e9-1e7a3a77f607/how_to_manifest_the_person_you_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6198cf99-bab3-44f0-a918-8af60d41957b/how_to_use_davinci_resolve_for_beginners.pdfIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_dece352021f24cc6963f1e56e39592a3.pdf?index=trueIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_b3d28f4868a54d74939033f3afa0e1e4.pdf?index=trueIn PDF document text
    • http://nugoxasozuvazet.rf.gd/does_oxidation_occur_only_at_the_anode.pdfIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_41dcbe1d162d43668b38cc9ee3cacff2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e466eec6-bdf5-4743-a4c4-53ab42698bee/vobivupodem.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 4976 bytes
SHA-256: 422cd7dc792c862ed9fa5015b7e329c1e22a48cee2e5a833b97f8a31eae93a4b
font_01_sfnt_off000106e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 11872 bytes
SHA-256: fce36155cbcd485296957a342ca3a1902685618a08149ee0b62fa4d633634db8

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