Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e9b02be18aa701…

MALICIOUS

PDF

43.4 KB Created: 2020-11-08 20:13:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d51a1b22ee804faaf141240503e7d529 SHA-1: 84dab28d7831d4781f3c08a0866117d76e5b9ade SHA-256: 85e9b02be18aa7014e6fa770a063e1c643de1e72459c8dcae35ac95be5af21ca
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to generate traffic or SEO benefits. The document body, though heavily obfuscated, contains a URL that appears to be a search query for a phone number, suggesting a lure. The presence of external URIs and the ML classifier's high confidence score support a malicious classification.

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://trafffe.ru/123?keyword=mechanicsburg+walmart+phone+number PDF link annotation
    • https://jozifopavix.weebly.com/uploads/1/3/4/3/134355896/132bc14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388157/normal_5f913ffec40a9.pdfIn PDF document text
    • https://duxobibalarig.weebly.com/uploads/1/3/4/3/134360367/sixinivubexizab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_5f99e0ab6508f.pdfIn PDF document text
    • https://zikotidule.weebly.com/uploads/1/3/4/6/134604350/1da76.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/8703842.pdfIn PDF document text
    • https://towimoni.weebly.com/uploads/1/3/4/3/134340956/a0318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374686/normal_5f8e21e345b94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tetazino/lixenojikujovexibabak.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/mumiwadamulisokub.pdfIn PDF document text
    • https://nudiverid.files.wordpress.com/2020/11/72222428130.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/zedetoki.pdfIn PDF document text
    • https://bixukuvapaxi.files.wordpress.com/2020/11/xugunamol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feae03af-19ea-4f6d-899b-98b63a90c195/wafejugivopimaxijiman.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/associated_press_stylebook_2017_download.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_off000069f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69F1 5584 bytes
SHA-256: e510c4b42662ee7c8385482d78b01d99793fb1f89a8d6afb6300a4518e1302f0
font_01_sfnt_off00007ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE1 10356 bytes
SHA-256: 8519fa193a63c342c923ac320b7aeb4da645b22631c2133f371db0299216da01

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