Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8409e5923632002…

MALICIOUS

PDF

71.7 KB Created: 2020-11-23 04:06:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 668622dbfb10824623d8da62d4bdbd5e SHA-1: be50687f3c287f3e40e1b3e81d8ea1d391899552 SHA-256: b8409e592363200259b43e9978d40bd5a33af5279156bb9878e7eac3ccb67f3f
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 0.9997

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://traffset.ru/wb?keyword=faure%20agnus%20dei%20sheet%20music PDF link annotation
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/b1876ef29c87.pdfIn PDF document text
    • https://waniremupamed.weebly.com/uploads/1/3/1/4/131407535/8c763fa3.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/4089950.pdfIn PDF document text
    • https://wabemogulumog.weebly.com/uploads/1/3/4/3/134384503/ffa5a8.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/833409.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/7dec4838-10fe-4472-8bda-da016cd7f313/microsoft_wireless_display_adapter_i.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8148615-6910-46e6-83fc-b80c3b82ae09/58902726790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/358ecf0a-c6dd-4133-af11-f268a13d5f1a/76291045110.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/25924483926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04e2f208-7e87-4ac2-9e88-84fde20c2338/17138589554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9195592f-b631-4955-b1e5-914ba3251f6f/nirisobifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e070fb-9f54-4edf-9b88-46a07e568b35/remapekekunulipipewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ffad3d-173b-45a0-9fe5-34a7c652bf39/37128237887.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC336 5276 bytes
SHA-256: 252567d69c1831c23c4a0d2ba993fbcff4d9ad5c1deb9aff7500ce3e0c02be66
font_01_sfnt_off0000d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 12044 bytes
SHA-256: b19326bbb273fbf323c77d51d7a375033e12c0373cc62068c275974384cd4846
font_02_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 16184 bytes
SHA-256: 75e56e6dc913dabd8b3c9cd5ea70025aeab0fff598b2ab24d9d660aeb9535195

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