Malicious PDF — malware analysis report

Static analysis result for SHA-256 a994bde5f8c6093f…

MALICIOUS

PDF

84.4 KB Created: 2021-05-28 04:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 88b08f58faedd59a3558e5009431fc00 SHA-1: dcae291ad3a1f59f5e7cba7711ff8f6574e06f37 SHA-256: a994bde5f8c6093fb7aa0205bbc29336ef8e77fb14c6b04c584b88a575c47799
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=how+to+control+impulsive+behavior+in+toddlers PDF link annotation
    • https://kolajinetam.weebly.com/uploads/1/3/4/5/134584148/koxarukofasuvapaxu.pdfIn PDF document text
    • https://kepinofex.weebly.com/uploads/1/3/4/0/134017679/4243824.pdfIn PDF document text
    • https://gedokepapivit.weebly.com/uploads/1/3/4/4/134464903/8652636.pdfIn PDF document text
    • https://lunafegosewexik.weebly.com/uploads/1/3/5/3/135351611/lopawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_605eeba114226.pdfIn PDF document text
    • https://bemikazuriku.weebly.com/uploads/1/3/4/6/134648669/bosojosoxolas.pdfIn PDF document text
    • https://mibigadoguful.weebly.com/uploads/1/3/4/7/134759919/5f8e4030b.pdfIn PDF document text
    • https://folawumir.weebly.com/uploads/1/3/7/4/137499585/dded107f29c1b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_60484e290c59a.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/bbf7b841-9e8d-4c90-a3c4-ab355352f7a0/contrato_de_alquiler_terreno_agricola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eebcac1c-7e94-4192-b698-5b11e38d87ce/wagewadiwam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c37a249-bf41-49fa-894d-2c736f2cdcc7/wigosekusexodetibefevej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e98e87-9d98-4b65-a7e2-18a3e18b57f7/pubg_mobile_lite_bc_hack_apk_download_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f8ce692-9308-4ed6-9784-4e1c11840de8/sasimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28dde70a-3a86-4dfe-aabf-87d18b61eca7/esperanza_rising_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e550fe32-2989-41ad-a0a7-c325031c1c06/95482313422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac0227c3-4771-4995-802e-e33823e3b035/how_long_does_it_take_to_get_drill_pay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1680b417-2fbc-4396-a6fb-b1c9ec1f7710/gofofuj.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_off00010b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9D 5568 bytes
SHA-256: 52c6b50e2d59c5471b9d5f3587b92a6462a0e95795dbcc69f190d30f411ebdad
font_01_sfnt_off00011e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E68 10496 bytes
SHA-256: fe22354af7ba3e9b0d83c72c5be2bea1cf9417bd420bae64f927ecdf9fa24fc6

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