Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65f5f447787a6b1…

MALICIOUS

PDF

33.9 KB Created: 2020-11-09 08:13:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2a2bbef596348c1c0643e5232a655017 SHA-1: e68f10df0d2a377e24080ffdaec952dd46664be8 SHA-256: c65f5f447787a6b1d9056423b976fcf1b5a1645c202ee708712765b2f9f0ee3f
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a heuristic firing for a link farm, indicating a large number of external links. One of these links, 'https://traffset.ru/123?keyword=otc+leak+tamer+6522+manual', is flagged as a potential malicious URI. The document body, though partially obfuscated, contains text that appears to be a lure for a manual, combined with the authoring application information, suggesting a deceptive purpose. The presence of multiple external links, some of which are benign but others unknown, points towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://traffset.ru/123?keyword=otc+leak+tamer+6522+manual PDF link annotation
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/9391773.pdfIn PDF document text
    • https://virataxutepubom.weebly.com/uploads/1/3/0/8/130874282/50411152885.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/55f8b905-0c28-46c8-9c71-04d739799ebc/vincent_ruggiero_beyond_feelings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d5b15c-ff60-48f6-8606-3285657f1784/iliada_i_odyseja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7d9c485-c568-4e8d-8e0a-39c4b7d67ec0/98996024410.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/21081227053.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/2020_irs_1040_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59964961-60ba-44e0-9dda-2102b9d481db/zezifite.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/87924577855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4e8e26b-7008-49b2-99a3-919d6bb0f2c5/wutiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e66c0a-2bf5-4a84-bb90-139199c880a2/tobereniwigebovozuv.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_off000044e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44E7 5268 bytes
SHA-256: 520cf74159640f69e9eadb29a0582a35ef92bb7f9148ccf6a899fd8e8120a354
font_01_sfnt_off000056c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56C2 10556 bytes
SHA-256: a89eacb89c4213e7f568de194df7d776a850387c365c5ba6b6b53d8dbcc2c000

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