Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f85f938e12c75d…

MALICIOUS

PDF

63.0 KB Created: 2020-11-17 18:02:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ee696b64142f42560ea3048d196e2ee2 SHA-1: cc1b789b2cea6e1d095c340597505d16a09287d0 SHA-256: 41f85f938e12c75d65d570c5c9c040da6b26539f60ea8222e59920cbd32fd701
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it links to known malicious redirector infrastructure, specifically flagging it as a phishing lure. The ML classifier and ClamAV detection strongly support a malicious classification. While no scripts were extracted, the primary IOC is the redirector URL, which is designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/strik?utm_term=separador+deaver+funcion In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377678/normal_5fa77299f16f3.pdfIn PDF document text
    • https://xigokujote.weebly.com/uploads/1/3/4/6/134649591/5e6728fe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_5fa22b989f00a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459059/normal_5fa17abf005d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_5f8d41d33a54a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_5f97c4d4e6e75.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/a52b4ce2-fe95-460c-9528-d5710da8f4fa/metrocity_sinema_fiyatlar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd71d449-7435-4a91-8244-e3201b540a79/98190816638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24a6c954-130e-4f2e-b92e-208df77f6c21/722908474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470a03a0-2740-4f20-80a3-2e8d48d26164/storm_king_thunder_maps.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/lolovaperuzatuvotiruz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/502fab9a-f6e3-4795-a2f1-c989589b7a01/adhere_in_a_sentence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e0773fd-ef5e-4553-97c3-16c4e23005c0/tijofubekulekili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ef46cb4-ab9a-4441-a8c5-5893a5d261d4/xuzaredixaxozokugafubugu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38F 1528 bytes
SHA-256: ed92cafd901dd1cf1e35098023afc6358b03ff7238836c92b52e0ef4a2243c99
font_01_sfnt_off0000bb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB57 5100 bytes
SHA-256: 6f239990da57929cd9e85947bb280b643690a48769f78832d708e3a16cef9b94
font_02_sfnt_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 10120 bytes
SHA-256: 65e371056d4d88fa636a6bd7b01cd59789f92102437d9c114f5144b99bff4b7a

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