Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e9776440e436e0…

MALICIOUS

PDF

77.6 KB Created: 2020-11-22 15:07:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5f8321184862001b183dfe4453decfd4 SHA-1: 6f3b87b2defa70461a2cddcb39c2c204c277d855 SHA-256: d9e9776440e436e08698de1ecfe7ee514bab48d38a0835c45efe3a967705da7c
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 0.9999

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://traffnew.ru/123?utm_term=water+cycle+webquest PDF link annotation
    • https://pudukodup.weebly.com/uploads/1/3/1/4/131407572/kesipoboremobo.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/5650151.pdfIn PDF document text
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/7029060c296f6d5.pdfIn PDF document text
    • https://pofemazavuson.weebly.com/uploads/1/3/2/3/132303373/3762798.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/ebc5f77d-a8db-4a35-8491-a9ec6bbfcfaf/gilezudujeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a23c30a-e165-4578-b976-84e42fa0bbea/zetebasag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c86538f6-0089-4f92-827a-16288f2f9f20/play_fancy_pants_3_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/jusizekikusolemurojipuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2316179c-9e2c-4e14-9359-bdbbd34891dd/delete_chrome_history_file.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/suderoxozal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/222de682-4f40-4461-b25e-169350fd7004/ridet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6aba49e-2560-4f70-8ac3-9dec759b1611/sifonuretitemegiro.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_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 5264 bytes
SHA-256: 88384a9fa65ca4a5a5328a613fb1291843c6434db3b30918b4d73a930690e68a
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 10360 bytes
SHA-256: 5832daa806bc05216d7f3b40b33f175feaf79b7a36d32ea3de5244437c8d9463

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