Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a1cdf07a957f5d…

MALICIOUS

PDF

77.9 KB Created: 2021-02-15 09:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 96a73ad68ceccf3181e36e8a76a97ca9 SHA-1: 28d4591d792b11ef1300828fc5b5a979fe4d755f SHA-256: 48a1cdf07a957f5d40684c3607d514a24a10ca31bb888f1fe5bd84925340bfd3
196 Risk Score

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
  • 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://leonvi.ru/aws?utm_term=worksheet+in+synonyms+and+antonyms PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382643/normal_5fcae93f89d08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419206/normal_6001c7cf64f90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_601cfdfcd5929.pdfIn PDF document text
    • https://cdn.sqhk.co/goremujoz/pjjidje/58823225823.pdfIn PDF document text
    • https://fupiledur.weebly.com/uploads/1/3/4/5/134527701/nabubodupuvugex_mapobozuxagi_sugetevix.pdfIn PDF document text
    • https://vavurozuzen.weebly.com/uploads/1/3/1/0/131070500/jukotu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420454/normal_5fc73fe9a1f66.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/ghggegc/62339919262.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469834/normal_5ff6bda839556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384821/normal_6029c3a62b9d6.pdfIn PDF document text
    • https://gumevuwogixuxuj.weebly.com/uploads/1/3/5/3/135317748/124fc6355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_5fe9383e78284.pdfIn PDF document text
    • https://cdn.sqhk.co/zazavoxujub/cBEjdhd/8745304267.pdfIn PDF document text
    • https://wedidosav.weebly.com/uploads/1/3/1/6/131637371/wejanozotefanode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_6022fe9d7a697.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litopuputorer.rf.gd/cambridge_primary_curriculum.pdfIn PDF document text
    • http://zewebuguv.epizy.com/goodreader_ocr.pdfIn PDF document text
    • http://tuvugerij.rf.gd/access_control_in_information_security_ppt.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_off0000f26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 5212 bytes
SHA-256: e0a0b596b33696f1c655c8d145ce6f63e398d8a8f1cd76a6fbbeb8632cef1e72
font_01_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 11296 bytes
SHA-256: 6da8ddb6feefff8d2f9f3b2157be3fba54a26814668cee5c0d27a76aa26b172f

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