Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d902d595f1479e3…

MALICIOUS

PDF

80.9 KB Created: 2021-04-02 13:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: db04d5ea7aa34790e417b240fe9ed307 SHA-1: eff37fb0c8b9fff222f1f33dccc3fe26d29ce8eb SHA-256: 1d902d595f1479e34ca2860e68b82163c43da507a2eaac177266293dc56bb5b2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via embedded URLs. No scripts were extracted from this sample, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/123?utm_term=humus+de+lombriz+roja+californiana+pdf PDF link annotation
    • https://bazubipevudupu.weebly.com/uploads/1/3/4/8/134876407/sanefab_talogawopafo_fatiro_zijewedaril.pdfIn PDF document text
    • https://zolidejowifaw.weebly.com/uploads/1/3/5/3/135313364/1499471.pdfIn PDF document text
    • http://italdom.fun/lanolin_ointment_davisj2gmu.pdfIn PDF document text
    • https://tagojakiwuki.weebly.com/uploads/1/3/4/4/134444274/7825922.pdfIn PDF document text
    • https://monopulo.weebly.com/uploads/1/3/5/3/135311873/pixodedekumum.pdfIn PDF document text
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/nuxev.pdfIn PDF document text
    • http://mpvideo.org/how_fast_is_the_2020_camaro_zl1lwruw.pdfIn PDF document text
    • http://livethailand.fun/513308846607jfbg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_5eaee2066e52475ab6ee2c2b891cf3cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/250ea0f7-3207-4eee-ac7a-3daf83b6f5d9/happy_endings_movie_trailer.pdfIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_32e0bbf711cb4a15ab80fd38eedcde95.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_3a5225530bfe431a84072a88c4f266a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5091c611-283a-4d65-98c0-f86dfb86739b/antigone_ode_to_man_text.pdfIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_c3d09116ecfa434bb0cbf6a6fcb362cd.pdf?index=trueIn PDF document text
    • https://d692b82a-d563-45ba-818c-0512d98079dc.filesusr.com/ugd/1c7397_aebf924fc1a4430688ed68ece231817d.pdf?index=trueIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_a8fdd63653dc4e138fa0604f2df80d8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75583136-3e75-489d-bf0e-7f1db342373c/how_to_change_battery_on_kwikset_smartcode_914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e5d09b-3451-46b4-a79d-5d634ce6efde/xoxij.pdfIn PDF document text
    • http://manuwakagekewu.onlinewebshop.net/great_is_your_faithfulness_lyrics.pdfIn PDF document text
    • https://619c993e-e215-4b07-891b-88776ecab8c8.filesusr.com/ugd/1fce43_973266350c684b4eb13dade9573347ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd19dfa3-250f-41a4-b142-177f4f2430e2/vertex_standard_vx_1700_manual.pdfIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_55804dd48b4445c5bdf759d4b2505ce3.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_f1364d27bd01461f8b796a23d55fdf38.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_37e417e9020b4c30944eea20284d8e98.pdf?index=trueIn PDF document text
    • http://pawuzax.onlinewebshop.net/naloboxelutawomal.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_off0000f925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF925 5528 bytes
SHA-256: 7a498c33fb72c30f296ded3660a51f616d8f9ae9098d1f01dcb13785d5f83ac7
font_01_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 12540 bytes
SHA-256: 0895d020eaff0e00d8cc64c0b4a44e02815e74fc20989c2fa4883dc7e2fcfd00

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