Malicious PDF — malware analysis report

Static analysis result for SHA-256 c225e5d40235a406…

MALICIOUS

PDF

72.1 KB Created: 2020-11-19 07:30:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a1c67d341eba243340ad446d584dd053 SHA-1: b796dd98a9ff40d90bcf26a2b87a4bdc573b3782 SHA-256: c225e5d40235a40626ab058e3b2c62c718cea9bf80379b3b163b1d97ffb9bdf5
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical detection for a link farm and a high-confidence ML classification. It contains numerous external links, many pointing to SEO redirectors, with the primary malicious URL being https://trafffe.ru/123?utm_term=nyrius+aries+pro+wireless. The document body is heavily obfuscated, but the presence of external links and the PDF_SEO_LINK_FARM heuristic suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://trafffe.ru/123?utm_term=nyrius+aries+pro+wireless PDF link annotation
    • https://xukutejupu.weebly.com/uploads/1/3/4/4/134487517/662ce8730f0.pdfIn PDF document text
    • https://kuvejepi.weebly.com/uploads/1/3/4/4/134452054/025d75.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/c828b75f-69bd-4892-9057-d04d38a87a31/wumomukeral.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/apk_fortnite_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/serial_number_photoshop_cs5_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/capitulo_5a_realidades_1_answers_page_91.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/vegetable_biryani_recipe_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea2b1d1-3c54-4055-b7c0-0183ad567535/novaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb22ac1-4c48-4f3d-9ffc-63e16736b241/9161076161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8e1c49-cecc-429f-b35a-d3bc35e06e90/kutagebofigolojejukalexip.pdfIn PDF document text
    • https://s3.amazonaws.com/tekujel/31446864707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd88b32c-6617-437e-9d37-27550b8046d8/porenened.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_off0000c6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D2 4976 bytes
SHA-256: b4faa5346613d2e9af3a3b077b6b03ad709b4c956570fe6522834442e2c2ad83
font_01_sfnt_off0000d7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 11120 bytes
SHA-256: f2d4ea5a1f31a8ab331f2e51d6d25032f6d6e5965f4e625c699d45c34cc6ad96
font_02_sfnt_off0000fe39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 16260 bytes
SHA-256: a56c3305eae8c274f9530afc53b94bb11aea5b2e4106fccae25e6adbba8aa2c3

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