Malicious PDF — malware analysis report

Static analysis result for SHA-256 1505130487fd0f90…

MALICIOUS

PDF

81.4 KB Created: 2020-11-14 11:12:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 62a38f9eb1b616c4c085f82f919d9ddd SHA-1: c95cd50e5b5eeed55cf3b7ead7c57f1f50766ec6 SHA-256: 1505130487fd0f90f00295ba3754dcb3294a1c96b192e10f1fc30ec73cf865ea
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a heuristic firing for a link farm, indicating a large number of external links embedded within the document. The document body, though heavily obfuscated, suggests a lure related to a "sharpening guide for chisels". The primary attack pattern involves directing users to numerous external URLs, likely for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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/aws?utm_term=sharpening+guide+for+chisels PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377674/normal_5f94aa8b6bcf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448337/normal_5fa07b81396ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412195/normal_5f94764ca1ef9.pdfIn PDF document text
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/vawolix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426953/normal_5fa854b84c753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_5f9210ebad156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5fa8e6a32f0a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369302/normal_5fa3eb0c4386a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7ee0138d-dd06-4d98-a8e1-29b6e4608309/bsa_troop_guide_patch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2779b89b-1e3c-4b9e-86ce-45f1ce62d53e/fagakorerasumapoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665b216e-20ac-423d-a78d-a2bbea4b85fc/58997481907.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_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 5324 bytes
SHA-256: 9575c28a2a7866a5f11fd3886eee3d4627874c0726d7858f3da8c87debc0736f
font_01_sfnt_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 10488 bytes
SHA-256: 601e809939bff8b4fd5ec02936394c2b528937f5f3f71509f4aeb7fdf2e2854b
font_02_sfnt_off00012a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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