Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfb5d59eb00f5f9…

MALICIOUS

PDF

76.6 KB Created: 2020-11-18 16:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cae1bd709f22353549aaebd106eb6464 SHA-1: 2b152440fee54f1b7a32fe89abbe257cd0d778aa SHA-256: 8bfb5d59eb00f5f9450201817a55e7176172cb1406986333b1f21cf8a1f0b269
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, traffking.ru. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of the external URI suggests an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=fallout+3+unique+weapons+retexture In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_5fa76f0d05bc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5f93839fb89bf.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/3f7b8cf2-1d25-4c9c-ab23-abcdc12ca404/31123052687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc79d8fa-997a-426a-82cf-6f29975aba28/mobizif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1daaaa58-f74f-474f-ac38-b80b71a7a1c7/lotur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0fd1c9c-611e-4fa8-b46b-2c22bae12514/blank_cocktail_recipe_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dbcba2c-fe63-4e3b-9657-53f70be4d520/in_iyi_film_izleme_sitesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24224646-bd9b-4f15-b228-e9830c213e1d/example_of_work_excuse_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f3306eb-c829-48e1-be40-f0585a1ff3d6/archeage_healer_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7094a8d3-daba-4278-a36c-5c8c6a6ecbc7/richard_cory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e01ceb-0cdf-47e5-a3fe-caddfbd00efc/25791903752.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/cummins_dg_abcd_checks.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_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 5216 bytes
SHA-256: 694c0664d2f7eeba82fa8d1f5a76898a866341e0f841cba8bfe497fc6c27717d
font_01_sfnt_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 10580 bytes
SHA-256: 740fb9b34eae2cf45c47367552ba01e79ffa66072d8d26e0e9c122b39372b6dc

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