Malicious PDF — malware analysis report

Static analysis result for SHA-256 944f5406683a2795…

MALICIOUS

PDF

63.8 KB Created: 2021-01-07 05:13:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: f64a4cf570231f701c25be50d07472e6 SHA-1: bc12bd5001856a0175fd9d69f81acbd7677763a2 SHA-256: 944f5406683a27953038aee86f728a00980f17555b329d37df23222fff266cc2
254 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, suggesting an attempt to direct users to harmful sites. The ML classifier and ClamAV detection strongly support a malicious classification. Although no scripts were extracted, the embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

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
  • 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.
  • 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.
  • 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://gettraff.ru/123?utm_term=plaster+of+paris+walmart+canada In PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/987b21c6b.pdfIn PDF document text
    • https://cdn.sqhk.co/wiluxuko/i84ggW6/coc_clash_of_clans_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/fiCJjgj/best_healthy_ninja_foodi_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/uxK5yif/mobile_facebook_messenger_browser.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/oiijhdw/world_adventures_login.pdfIn PDF document text
    • https://fiwitoritare.weebly.com/uploads/1/3/4/5/134582968/fepago-nadikupekifare-gadedux-mozomarukago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445743/normal_5fbdb61373b39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_5fa432c48b2cc.pdfIn PDF document text
    • https://wixozini.weebly.com/uploads/1/3/4/3/134383912/rejunowujoza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_5fe9a8cfb92e9.pdfIn PDF document text
    • https://retarabad.weebly.com/uploads/1/3/3/9/133997928/e7a00389979975c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378843/normal_5fbd6b084beac.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/0Y3Dhhy/96490339640.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/ujbsgcy/97992167608.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/115e33b0-9add-4a55-a820-26d97c7cfcb3/cybis_porcelain_price_guide.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_off0000bb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6E 5396 bytes
SHA-256: efaa372c93a1110506310ff13d45c20c4c1c5482b1356d9e7656b6b0b17bdb2f
font_01_sfnt_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 10880 bytes
SHA-256: 5fc7ec19b8d8cf3fe84bb44e1ec852ee49457513e42a93285a8d32db245c4fcb

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