Malicious PDF — malware analysis report

Static analysis result for SHA-256 df500b9ce8615668…

MALICIOUS

PDF

80.2 KB Created: 2021-06-10 13:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 551546f2070b52c72b9acc622b2575b8 SHA-1: e08a212a97e162ccdd01e26aa3254fb1dbac487a SHA-256: df500b9ce8615668e7246c0d09381c65caf86a14a9e8c2e77cb884938cdf5e83
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating it hosts numerous external links. One prominent URL, 'https://coretry.ru/pbw?utm_term=icloud+unlock+deluxe+free+download+full+version', suggests a lure related to software downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/pbw?utm_term=icloud+unlock+deluxe+free+download+full+version
    • https://cdn-cms.f-static.net/uploads/4411921/normal_606a98489f4fc.pdf
    • https://cdn-cms.f-static.net/uploads/4375528/normal_60601bac677a1.pdf
    • https://cdn-cms.f-static.net/uploads/4374518/normal_60be1a4aa8a96.pdf
    • https://static.s123-cdn-static-d.com/uploads/4376099/normal_60b3e15fabb50.pdf
    • https://static.s123-cdn-static-d.com/uploads/4411483/normal_60b4ced0315e7.pdf
    • https://cdn-cms.f-static.net/uploads/4377095/normal_601911fde64e7.pdf
    • https://static.s123-cdn-static.com/uploads/4373768/normal_5fca245827d48.pdf
    • https://cdn-cms.f-static.net/uploads/4383678/normal_604a058998e77.pdf
    • https://static.s123-cdn-static.com/uploads/4449205/normal_5ff8fd064f95f.pdf
    • https://vinifobak.weebly.com/uploads/1/3/5/2/135298549/dewawu_xuwov_womixujosawibag_woxadi.pdf
    • https://static.s123-cdn-static.com/uploads/4475196/normal_6007404cd64a1.pdf
    • https://cdn-cms.f-static.net/uploads/4451549/normal_605b7ef745f24.pdf
    • https://cdn-cms.f-static.net/uploads/4483088/normal_601b9e1d7b13b.pdf
    • https://fegikunula.weebly.com/uploads/1/3/4/4/134482285/nusorasi-jakexilibokudeb-sefipamitorivi.pdf
    • https://static.s123-cdn-static.com/uploads/4386837/normal_5fef6465af0c2.pdf
    • https://cdn-cms.f-static.net/uploads/4450434/normal_60384ad113e34.pdf
    • https://static.s123-cdn-static.com/uploads/4378405/normal_5fc9e4f9af281.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8dfa606f-537a-4417-ab1c-46657e272851/31679137096.pdf
    • https://uploads.strikinglycdn.com/files/3ceaa89b-1d8e-4060-87a3-4da0aad6dd1b/best_pellets_for_ruger_air_hawk_elite_2.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb68.bin
d29d61638c6ef53c943ed723ba85b110279a50649c5bfb8ed3a50b2ac50605c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 5236 bytes
font_01_sfnt_off00010d64.bin
1d00bf1c7f2e01fdd7c419811f5a102cdb668771d51a918e0381f5dd358dea66
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 11100 bytes