Malicious PDF — malware analysis report

Static analysis result for SHA-256 357d6d1cfda3b0c1…

MALICIOUS

PDF

67.9 KB Created: 2020-11-10 16:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b947fda027c878809612c3adf0932f85 SHA-1: d0c36983f46d5bf0d1d375db369471d4f0435c63 SHA-256: 357d6d1cfda3b0c1d18aa5d69062ee1159e92fba1d07c09def741859fda99425
186 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=gaxley+s8+%252B+verizon PDF link annotation
    • https://dujodorenenap.weebly.com/uploads/1/3/4/4/134488447/duvepipuroduf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382952/normal_5f93d2f2aaea1.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/784014.pdfIn PDF document text
    • https://nagilozumovamag.weebly.com/uploads/1/3/4/3/134317868/jevivebikugirawul.pdfIn PDF document text
    • https://tujelogujonugi.weebly.com/uploads/1/3/4/4/134491942/mapimenapuso.pdfIn PDF document text
    • https://desaviguwogo.weebly.com/uploads/1/3/1/8/131871994/4219926.pdfIn PDF document text
    • https://mibaxezaju.weebly.com/uploads/1/3/4/6/134641270/kisirisefe-jekowi-kukaxogavaf.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/6472802bf5f4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_5f91e1ca5b429.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/1bd8bf67-1288-46a8-85fa-7fc66ca10e1c/roblox_veteran_badge_picture.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/48431226359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6e6d38-45e7-4da5-a6e7-2940006c69ad/wizogirinugetavajulinum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bdd1d9a-9526-40eb-8321-54e956cefcfd/the_startup_owners_manual_ebook_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17a8c012-11da-4468-96b8-d007f52a8fbf/pusodawolovinefom.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_off0000cc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6F 5184 bytes
SHA-256: e448fe0a6feab9d181818058d931212061569d96b31d270b2bac7424952b4710
font_01_sfnt_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 10812 bytes
SHA-256: 53e2fd34ccd82863ba5b1ea0a8c923ebcf9a248a3db89632829a7c67e7385831

Open this report in the interactive analyzer, or submit your own file for analysis.