Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd548f92d2ac09a4…

MALICIOUS

PDF

68.2 KB Created: 2020-12-27 07:40:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4bb3bf588d4c7cee8943559f9f70d725 SHA-1: 1e21782037abb44e5c4657cfd6ad1e800553b830 SHA-256: bd548f92d2ac09a4043292a58b4e811cac67d08569f1e0ad21b284974af3fe0b
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-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.
  • 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://traffine.ru/123?utm_term=casas+de+empe%25C3%25B1o+online PDF link annotation
    • https://kuginipa.weebly.com/uploads/1/3/4/8/134853520/8460453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386822/normal_5fd3423366771.pdfIn PDF document text
    • https://jezafemobad.weebly.com/uploads/1/3/1/3/131383748/b6d2782f1eff.pdfIn PDF document text
    • https://malebikixolu.weebly.com/uploads/1/3/4/3/134358595/eebdc279.pdfIn PDF document text
    • https://nowebapimigofok.weebly.com/uploads/1/3/4/3/134338607/1744542c6e.pdfIn PDF document text
    • https://sipasegeremiraf.weebly.com/uploads/1/3/4/4/134404187/4754475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_5f90379c40b9a.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/ee5007eb-f74b-4bd0-b3d6-60a699d79a37/p90x_yoga_x_full_workout_video_downl.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/important_full_forms_of_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/1237010296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a5aa47-6f22-4f70-9aae-7400d73a74cd/watch_free_online_underworld_awakening.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb9fa614-b8e4-4a15-ad19-301562b8180f/fodavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf7c67d4-424b-43b5-8c08-290d0d04530d/12115039314.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_off0000c96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96F 5128 bytes
SHA-256: f20a3423bd6bde22c87489b3406b99028473e1ba09c7bbfa7b1fa08d7ab91290
font_01_sfnt_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 12316 bytes
SHA-256: d1bcd3cfb554ecf90034f02bc361979d4189d0e3e0f0df5dcf3bb04dab85a94f

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