Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef31af18f4b0bc7a…

MALICIOUS

PDF

75.6 KB Created: 2020-12-08 11:25:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 030da101c95c89b61565d6afab570832 SHA-1: 21f6b3ed4ad15463520d039293fc5ee27d9f5743 SHA-256: ef31af18f4b0bc7a88012ad3ddf7012982d260e81aa286a32d8d22150bc1e1e9
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/strik?utm_term=liga+boliviana+tabla+acumulada PDF link annotation
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/jovapawiwafite.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/xizisamej_lusuzupe_tuzid_tejuzosobu.pdfIn PDF document text
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/1140852.pdfIn PDF document text
    • https://dujulofenali.weebly.com/uploads/1/3/4/5/134587776/kakoduwolugetibow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc27dae5bcb0228a28c7d06/t/5fce548c24c49707d35001d0/1607357580418/83387726986.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/27032891801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a71a3d9-bd8f-4d53-81b0-830a2910d366/salutenugodowebilan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55b53b9b-0db8-4ed8-9aef-b7b07940470d/the_penguin_history_of_latin_america.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/zezojikuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/61872053150.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/brasseler_usa_catalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d02fa2e6-8b08-424d-895b-ac411baadba0/79804133722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53d6e403-b816-40c8-a02e-f25d617fc47b/third_grade_math_timed_tests.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6fe647f-54c1-452c-ba30-a9caeb0d2a14/rimin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52852436-58a6-495c-89b4-82fdd4f9a312/vw_beetle_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ef59a0-7f51-4fdf-a1d2-a23a34f0fc5b/baxenivoko.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_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 5128 bytes
SHA-256: b420945244b3353ec7e879e72258dfd1300751bf946742992837a252055991b5
font_01_sfnt_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 12008 bytes
SHA-256: 7a0b586be19eb24fb48e3192ef8faa9d95fa4deaf8d7c4b693302a24208610e8

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