Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9a491f83e5fa59…

MALICIOUS

PDF

67.1 KB Created: 2020-12-01 19:04:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a3c6c063f28ea174f6ad2b230f25114e SHA-1: 92e7a16ada3d409c44a260284dde248dc124a1f8 SHA-256: da9a491f83e5fa5940fbb69eb6d5027872ad6839931688b4095002b6074d31d5
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-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=meaning+of+holistic PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407084/normal_5fad8cb8d5764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377905/normal_5f9c697c714a6.pdfIn PDF document text
    • https://birivuben.weebly.com/uploads/1/3/4/6/134618962/7580456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_5fc035609f0fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_5fadacb95f6c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5f9eacbb63d4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422912/normal_5f990af00f41b.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/5fbce344be7cfc36344e8aaf/t/5fbf575308845d0924817a97/1606375252509/spongebobs_pet_snail_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f44ede05-62bb-4dbe-a1ee-1399f96de9e7/diseo_y_distribucion_de_planta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91fa3c75-2538-4e2a-b4a2-a55956997035/islas_de_la_bahia_honduras_fotos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f73d1621-b175-4578-a7d7-0a826748763d/nixon_outsider_tide_watch_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1c3fc3dfdd95b60db3ffd/t/5fc5994e3f75b1664394c224/1606785361025/short_queen_rv_mattress_cover.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5bc19403f5353fdb6adec/t/5fc617d261e25426e108584f/1606817746925/piwipato.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc00a03c6229360eca839ab/t/5fc2710c08845d0924d8dda3/1606578444963/ugliest_wedding_dresses_on_say_yes_to_the_dress.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd9b8ef7301f8b108504/t/5fc28887bc819f1cf42ac6b5/1606584456101/19972776760.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_off0000cb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB44 5052 bytes
SHA-256: 730831dbaa447926cc6bea1033d97fecc1dbc2ebfe6caa7af493d67a6af14330
font_01_sfnt_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 10420 bytes
SHA-256: 6028cb0f42275a9f0a941af35973bd9397481b5c954a6fa8edf2af993cfd82e1

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