Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a1170729383234…

MALICIOUS

PDF

75.2 KB Created: 2020-12-23 16:48:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 60361e67802ac3aea799f0bd0fc2d47a SHA-1: e6a19803654718e5e8d5aadcfb819bdf217d6c43 SHA-256: c8a1170729383234cf5bdd406d928a13a4b6b558c5fe740315d525d8746f31b7
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF_SEO_UTM_REDIRECTOR_LINK heuristic and an embedded URL pointing to 'traffset.ru' suggests a phishing lure designed to redirect users to a malicious site. Although no scripts were explicitly extracted, the PDF structure and heuristics strongly indicate it's used as a malicious attachment in a phishing attempt.

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://traffset.ru/aws?utm_term=sum+of+a+finite+geometric+series+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375339/normal_5fd67da1455f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502268/normal_5fd7228e32212.pdfIn PDF document text
    • https://cdn.sqhk.co/kowazodonaf/iiagi2O/80001307833.pdfIn PDF document text
    • https://cdn.sqhk.co/xaderimi/chMiggh/first_horizon_bank_mobile_deposit_availability.pdfIn PDF document text
    • https://cdn.sqhk.co/fakobijo/C5kTggF/residual_definition_psychology.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485821/normal_5fc69d686cb01.pdfIn PDF document text
    • https://cdn.sqhk.co/fojoravuvu/gdjjPjg/nunovuzajagodavujon.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/ninazarila/antd_form_typescript.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e0128b9-e274-49ad-81b7-b69d99e8071e/65256377418.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/farmers_insurance_group_annual_report_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d14c1db-97e1-427a-98d0-66595fc400a1/vines_high_school_yearbook.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/49673574582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d71a5b-a1e4-4c3d-a117-4d9c759f4b88/mr._alexander_physics_vector_addition_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a77c2666-c76d-4d37-a246-087bc359b938/27167739141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4053ddc9-a314-42cc-a839-ef7728df40c7/29832048065.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD180 5524 bytes
SHA-256: 6d89664d0c247ca02e2f56bd9ed18db3781b4b8ca0487151ac335abada2653bb
font_01_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 10524 bytes
SHA-256: 0c7631c41e05c3d9948a7c93c79a4dd06c94f0a6288bf3c3e28b3be7adb871f1
font_02_sfnt_off00010869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 16708 bytes
SHA-256: e9d6e4db8ffde5b50c210226a9f476625c610f4c3acc32c0606dea4604ef8ff1

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