Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea09a638fcb54e9a…

MALICIOUS

PDF

86.3 KB Created: 2021-05-26 20:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 234349ac645c8815f533bd87e4c96d91 SHA-1: 49ab530cbc6a1f28bddbb3c52876f67004200b84 SHA-256: ea09a638fcb54e9aa4e3a188b684b38fe2a07077c37309bc04bf27083022ce50
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with a critical heuristic firing for a PDF link farm. The document body contains a deceptive lure related to downloading a song, which directs users to a suspicious URL. This suggests a phishing or social engineering attack aimed at tricking users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=happy+birthday+song+download+free+mp3+in+hindi+with+name+list
    • https://cdn-cms.f-static.net/uploads/4495269/normal_603995e38ea6e.pdf
    • https://jerupixudenaxi.weebly.com/uploads/1/3/1/4/131437293/famixas.pdf
    • https://cdn-cms.f-static.net/uploads/4427287/normal_601cbcb468281.pdf
    • https://cdn-cms.f-static.net/uploads/4405641/normal_60494be0eee13.pdf
    • https://gosupafitowiru.weebly.com/uploads/1/3/4/6/134673249/e1f9ca157360831.pdf
    • https://static.s123-cdn-static.com/uploads/4367687/normal_5ff852fc762e3.pdf
    • https://cdn-cms.f-static.net/uploads/4474176/normal_601f536a9b312.pdf
    • https://resojuwow.weebly.com/uploads/1/3/4/3/134351964/sogoragik.pdf
    • https://static.s123-cdn-static.com/uploads/4414169/normal_5ff20480e3f47.pdf
    • https://gaxuzuwe.weebly.com/uploads/1/3/1/8/131871814/dobiz.pdf
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5fd61d5b0be1e.pdf
    • https://pajilolupifi.weebly.com/uploads/1/3/2/3/132302794/vifagevide.pdf
    • https://cdn-cms.f-static.net/uploads/4369168/normal_6042208fd9f60.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0579c2f7-ad5f-4eda-906f-edf0d4a21401/technology_due_diligence_report_template.pdf
    • https://uploads.strikinglycdn.com/files/a5b2acbd-6b90-47eb-a542-8f4dcbac0108/55986234494.pdf
    • https://uploads.strikinglycdn.com/files/7145f193-85a7-4104-8950-bb53a26489e3/rowilakaduzijozusareminin.pdf
    • https://uploads.strikinglycdn.com/files/72a25f3d-c82e-4d28-845c-36d6e02fb990/2007_mazda_cx-7_reliability_rating.pdf
    • https://uploads.strikinglycdn.com/files/64aead7d-3537-4465-859a-bcef51984eb9/song_of_fire_and_ice_release_date.pdf
    • https://uploads.strikinglycdn.com/files/3aad3b95-6637-45e9-8fb3-0763f84d1125/90517318582.pdf
    • https://uploads.strikinglycdn.com/files/7daee476-402d-48a9-9a41-d35f1469b63f/vudukajif.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd8.bin
91072ca843e263c38b04bf2a5cf4d03d8d6f47680d6d400a7f68f405f49c5f1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 5916 bytes
font_01_sfnt_off00010fe5.bin
acc31ae1f069b0947c6ce8be59eab9c5eac20f92f8e24723746b9fcf1f189ebf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 11040 bytes
font_02_sfnt_off000135ab.bin
cacce353daa52449aaa2dc03ff14e12d7f37b8e2e541d6bae97b449db5f5a003
pdf-font-stream PDF embedded font (sfnt) at offset 0x135AB 16248 bytes