Malicious PDF — malware analysis report

Static analysis result for SHA-256 39851cdd17fa19e5…

MALICIOUS

PDF

98.0 KB Created: 2020-11-23 12:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 30d5a8b236a0c384f8b5781ac68b8806 SHA-1: b925ea8e1ea47249913ea361afd2062c839782bf SHA-256: 39851cdd17fa19e53c83603ac4ae52a2a8664637807f75ae6b8d6e1382ea5818
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffine.ru/strik?utm_term=druid+campaign+guide PDF link annotation
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/8208063.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/mijumomub/avg_vpn_android_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae6bf40f-d3b2-49fc-916a-ae14849b1a34/games_for_bears_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/bogue_s_compounds.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/elementary_education_powerpoint_templates_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfb1e265-cab0-41ef-872d-601bfd4ddcf5/coloring_pages_for_july_4th_free.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/71108148395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7028f5e5-730b-4708-8545-0438142d67ff/flor_y_canto.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/unblocked_for_school_online_shooting_games.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/papa_s_pancakeria_papa_s_games.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/words_beginning_with_gly.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12984 6568 bytes
SHA-256: e004192c140286abd41d3be855d31c3a0acb2d7e0716deb523c460c6d603b4d1
font_01_sfnt_off00013f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F47 5180 bytes
SHA-256: 2890bf0f8b181c63c5fbbbedd2cd179a66323dd68c601302bb99da5ed52bb8d9
font_02_sfnt_off000150d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D3 13532 bytes
SHA-256: 456526e11bb388dbd9e369714b6d8e308ebee2827cceafbe93c6d81e7bde3a21

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