Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ab1e0c9b339a95…

MALICIOUS

PDF

81.3 KB Created: 2021-03-05 05:01:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 631aaac8f566a10e771e0cabda155802 SHA-1: 2019d8ac40bf3b17b806ba5161260ead8d58a6d3 SHA-256: 40ab1e0c9b339a95d0daee668800ed76222b16f7e495b648c36e6943c7ea2edc
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a lure referencing a 'bulletproof keto diet book' and includes a high-risk heuristic for an SEO redirector link. This link, https://jottigo.ru/strik?utm_term=the+bulletproof+keto+diet+book, likely leads to a phishing page or a download for a second-stage payload. The ClamAV detection and ML classifier further indicate malicious intent, consistent with a phishing or malware delivery campaign.

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
  • 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://jottigo.ru/strik?utm_term=the+bulletproof+keto+diet+book PDF link annotation
    • http://salonhq.xyz/nidewifalusizowagexizotvru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465397/normal_5fdbc9de10448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450250/normal_6010cba8bfd1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421460/normal_5fec6761494e6.pdfIn PDF document text
    • http://spindlndou.space/masha_e_urso_portugues_portugalkl4ys.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5fc612a34ddc1.pdfIn PDF document text
    • http://reduslim-italia.website/game_launcher_applef2iw3.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/phcjczW/emergency_dentist_near_me_medicaid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366040/normal_5ff829b2bd976.pdfIn PDF document text
    • http://copyright-securityx.com/canto_ostinato_sheet_musicrjgli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475375/normal_5fec8ee418e70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5fe2c9d962227.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/fdQmayo/zaxemotabuzurusosalem.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/dslr_blur_background_apkltmw5.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/idTwggA/nadadodotas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/87655411329.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/lisusurozewajelowolajeri.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/ignou_admit_card_december_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/18850882978.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_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 4896 bytes
SHA-256: 1a73bcc42db84cb4eae6bb47510340739a3193324bca88dcd8b8ad79abfe8d75
font_01_sfnt_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 13252 bytes
SHA-256: 472d8b6655d49f0692da732bb59610723644d49e541e722867b2683beb3f05da

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