Malicious PDF — malware analysis report

Static analysis result for SHA-256 357b183f26a9c1b1…

MALICIOUS

PDF

65.1 KB Created: 2020-11-18 08:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 59e6415056c9bf36728abe2c4e691100 SHA-1: e9aecead677e309bab750d674169d6dee54ab9d2 SHA-256: 357b183f26a9c1b178c0c022fc46ddb7fd0eb85d832099059c850198c9894404
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm, indicating a phishing or malicious redirection attempt. The primary URL, 'https://traffnew.ru/123?utm_term=hoover+floormate+deluxe+manual', is used as an SEO redirector, suggesting a lure to download further content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffnew.ru/123?utm_term=hoover+floormate+deluxe+manual PDF link annotation
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/gasegajefiw_tazol.pdfIn PDF document text
    • https://dikoriwapajok.weebly.com/uploads/1/3/4/4/134447187/rumekovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424027/normal_5f9a6a33d399d.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/402300f5-cedb-4198-a0f9-a0eef1984361/9496134237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c6c216-1821-44b6-bb68-4a6d7db8a467/roy_lichtenstein_drowning_girl_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0d4523a-0c3b-4703-8ab1-560636ca6836/gazafotopojojisaxapolipos.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/wuzizaziwowenenew.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/simplifying_complex_numbers_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b906b60b-603a-4cac-819d-22464fc4b3bd/55837507873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38673738-88fb-4e7b-a6f2-ac657a151f9c/15520344472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/661e1cf9-2c9a-493e-b8cd-5a65986d91a1/ratedesojupiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87ea6be2-2a16-4165-ab1f-4d1fc8b4dcf3/soma_e_produto_das_raizes_exercicios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c7a080-9e3e-4a56-aae4-9f95cffb53ff/tusugijaveziwenos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0164abfa-ccfe-4825-b572-cfdfcf73a42e/pass_google_educator_certification_exam.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAD 4964 bytes
SHA-256: 0a055b00ee867a38ecfd7f7278b1f17bc0e2f45519e5626d1e8e2631ac9906f8
font_01_sfnt_off0000c082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC082 9716 bytes
SHA-256: 395a67931f48716d7cf232479f3c5d03b6419e21bb5ff6781cdd6cf56b8a8e76
font_02_sfnt_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 16232 bytes
SHA-256: 95bdf1e51c91a347532f4b179d39af09e29107d578526feb1362f61cac632cad

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