Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb434c365b4e34cb…

MALICIOUS

PDF

71.9 KB Created: 2021-04-02 23:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45c457f6331e8eadd7596df59920b482 SHA-1: 26e68572eefc6d4a319420af205904f57fe03cd3 SHA-256: eb434c365b4e34cbec55c4c4e84bb1aadb1a3471a1061548b8c236d2703f76b4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/award?keyword=barmer+map+pdf
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/jubosu.pdf
    • https://cdn-cms.f-static.net/uploads/4418993/normal_6026f8bc04644.pdf
    • http://kuroramogesok.iblogger.org/kuzulijetuk.pdf
    • https://cdn-cms.f-static.net/uploads/4480161/normal_606225afa344c.pdf
    • https://bufuxilanu.weebly.com/uploads/1/3/4/4/134402831/991694.pdf
    • https://cdn-cms.f-static.net/uploads/4389387/normal_600b614828634.pdf
    • https://kiniwotonupit.weebly.com/uploads/1/3/0/7/130776343/8351504.pdf
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5fd0a35a45d52.pdf
    • https://static.s123-cdn-static.com/uploads/4461773/normal_600662e732540.pdf
    • https://cdn-cms.f-static.net/uploads/4452217/normal_60473b3b4e581.pdf
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/85d1ae191df.pdf
    • https://static.s123-cdn-static.com/uploads/4417029/normal_5fc69dfc9bcce.pdf
    • https://cdn-cms.f-static.net/uploads/4420905/normal_600d681fdff6d.pdf
    • https://cdn-cms.f-static.net/uploads/4407789/normal_602fdc21b51c2.pdf
    • https://cdn-cms.f-static.net/uploads/4424996/normal_6051bc6c1348c.pdf
    • https://vemisalisak.weebly.com/uploads/1/3/1/4/131437925/1656943.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://watavevolowun.epizy.com/93330939459.pdf
    • https://uploads.strikinglycdn.com/files/c6af83ae-c72b-4bb0-bef3-62d96696447d/midi_to_cv_arduino_uno.pdf
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_c256be3c64224f199f58dfdede21069c.pdf?index=true
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_1324b58d34cc49278be6a7d1c69341ed.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0911380b-dac5-4c00-9e32-a43f812644b6/operating_system_concepts_essentials_8th.pdf
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_34ff3e42e15749c8a06a50a6310f2343.pdf?index=true
    • http://bijalupukupami.rf.gd/gemotevetepamivozixa.pdf
    • https://uploads.strikinglycdn.com/files/3e9ef3c6-dffb-4f2d-9980-09753519534d/gefokujawogekosinifulenak.pdf
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_09e4bd4b14df4f6eabcdb42775975e73.pdf?index=true
    • 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_off0000daab.bin
58a5d1d0ff57dace63b7c22caad736799aaad819f846dae18f2131219aaa9878		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 5028 bytes
font_01_sfnt_off0000ebb1.bin
fc8c68e57ce673dc6e1c547c267149d425f3ca211a79de7e8f58f23f777f0072		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 10856 bytes

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