Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34cbc0ee50056f8…

MALICIOUS

PDF

94.4 KB Created: 2021-03-25 16:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6fce6a108853650c81f96fd5df84395 SHA-1: 229fa2bbb831ad7c8de28b90d8a5fe3733768205 SHA-256: c34cbc0ee50056f8cc1dc79a81bc2ee1a897f8baea1b30d4429a49ae8267a52c
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 are dynamically generated and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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://resalured.ru/123?utm_term=convex+lens+and+concave+lens+pdf
    • https://cdn.sqhk.co/jifegusewe/ieWOhi6/7044563867.pdf
    • https://cdn.sqhk.co/wimiwupo/iYjgz6M/suleritufakagewut.pdf
    • https://cdn.sqhk.co/pumibavi/iFgiiiy/76555622483.pdf
    • http://pewekelexu.mygamesonline.org/25237698762.pdf
    • https://cdn.sqhk.co/takoxuwal/gRggzEg/rolibam.pdf
    • https://cdn.sqhk.co/fujalapevame/z1ij3gc/bowling_green_leigh_christmas_menu.pdf
    • http://zodatowafe.getenjoyment.net/50844520843.pdf
    • https://cdn.sqhk.co/goxufime/hieihs3/29118759539.pdf
    • https://cdn.sqhk.co/wimedizi/ehezGWi/15488034766.pdf
    • https://cdn.sqhk.co/mukujoripu/jfibgir/photomath_web_app.pdf
    • http://xevusezes.medianewsonline.com/xedemepusuloloni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vojapu/modelo_de_memorandum_de_llamada_de_atencion_por_inasistencia_colombia.pdf
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_d920316c897a43a3a8a0bcf5d3da8ab5.pdf?index=true
    • http://xukokumo.myartsonline.com/accommodate_meaning_in_urdu.pdf
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_fd5708c6ce894e048e87ec4b0117c58f.pdf?index=true
    • https://d2ffd92d-ad89-4e9b-8359-126286817a3c.filesusr.com/ugd/dd9784_1ed940d6b23c4df2bfb70c9dbeccaf8f.pdf?index=true
    • https://s3.amazonaws.com/mupukesunobaga/42739964462.pdf
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_f4d9fb787e10425bb46bea6edda1fb6e.pdf?index=true
    • http://jowosos.myartsonline.com/where_is_the_calculator_on_chromebook.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_off000132d0.bin
d11a36acd8b91d81ed566da10c162c8ec48f9a5c6ab81e47c324f79e12901027		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132D0 5088 bytes
font_01_sfnt_off0001443d.bin
c658128394f18e5207336a9402a3799b931d6abd986d12e28455a233ac251d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1443D 11600 bytes

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