Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8911d0e3777cf1…

MALICIOUS

PDF

74.0 KB Created: 2020-12-20 22:58:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e0066a776d89a823a614e2e4ca439c8d SHA-1: 9dc7212b3c4c22328e00fe9264ada393564377d0 SHA-256: 7b8911d0e3777cf18b0324adfe289b36b7ec7692dde95774009da1997b1b0e73
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document exhibits characteristics of a phishing lure, specifically using a fake CAPTCHA or MFA prompt to deceive the user. It contains an external URI pointing to a suspicious domain, likely part of the phishing infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with credential harvesting or the delivery of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://trafftec.ru/strik?utm_term=whatsapp+business+code+text PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404524/normal_5f9fc16a2a4bf.pdfIn PDF document text
    • https://bupagaxeni.weebly.com/uploads/1/3/4/7/134706040/deritizeriwesi-terizirikuzud-wejazimopojinig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_5fc21f5e111b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387219/normal_5fcf78d12f267.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482403/normal_5fcabca451d90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f878499dd175.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/rutufokedizon/arithmetic_geometric_progression_solved_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b814742-2f0a-46dd-b117-9e5b5fa6edbd/28545132656.pdfIn PDF document text
    • https://s3.amazonaws.com/lodunixodetum/what_is_extinction_and_inattention.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/afcat_1_2020_notification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c1671f6-b5da-4ab3-8602-5d827fa65e7b/photosynthesis_crash_course_biology_8_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7604f736-c89d-4336-a516-887704cf538c/demigod_diaries_amazon.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1B 5256 bytes
SHA-256: d8b70f21db5c09e7e7409deb308d08d26404f210f79f3a60d2d353b38f0b4d4c
font_01_sfnt_off0000df04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF04 11288 bytes
SHA-256: 378e2136cab670a0082efa553ccf7d287cdfe84f3de71b751e5dcfe39b053293
font_02_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 16396 bytes
SHA-256: 4e74c91031341c06b915725d15f052d77c33d75b7b3102a675f469d94d5ad539

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