Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c4202c4d3a8060…

MALICIOUS

PDF

66.1 KB Created: 2021-01-04 20:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 846576690224e68e01f053934c21afa4 SHA-1: 9360e96dfb6e1afe6175edb0179a4efbb71ac029 SHA-256: 63c4202c4d3a80606b2c6e01121f93ba4c4e7a7615e1c6ac8a1366c01607400c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or phishing attempt, as flagged by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also strongly indicate maliciousness. The embedded URLs suggest the document is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

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
  • 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.
  • 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://trafficel.ru/123?utm_term=word+wall+cards+pdf PDF link annotation
    • https://cdn.sqhk.co/ludozenidi/Jsiacjd/the_trial_of_the_chicago_7_review_variety.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/7d3707d5d.pdfIn PDF document text
    • https://cdn.sqhk.co/japewaturu/0barMIi/gazutozikodipajupero.pdfIn 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/afbce81c-db85-451f-ad35-8bff967ee56d/69692769781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/549d6e09-431f-4638-b69b-647677bada67/55727324502.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/old_marathi_audio_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35da83a3-da5c-4da3-b4d0-7120b72fce72/savarese_omt_review_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/dietary_guidelines_for_diabetes_type_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a175ba0c-b064-4345-9684-2f7702a72069/57186220215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf976fc-1b4d-4ea0-ba0b-c1e0db61012f/91366921163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7beb3efd-916f-4050-b5d2-8a089cdb5441/how_to_unarchive_facebook_messages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e1e79d-83f5-4653-801e-f3a53659c63b/5020052228.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_off0000c566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC566 5252 bytes
SHA-256: c57fc3bfd02b29a5dd5681e8bba2945743c5fdd45bc874d481573acc151e8124
font_01_sfnt_off0000d76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76F 10276 bytes
SHA-256: 4eb6d8d47ec7cf7f311126f489050dadb6c1640a732e324a7762d7a1c8531017

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