Malicious PDF — malware analysis report

Static analysis result for SHA-256 de09b5a9703892ff…

MALICIOUS

PDF

79.2 KB Created: 2021-03-30 21:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 537575b2b5b4b2d46bae03c73424c62f SHA-1: e04be595260c69b29864c33c1a21e4128e53e6b1 SHA-256: de09b5a9703892ff6afeb45033a41a6b01fdcdf79aa2a2f586dd5d421521d9e4
176 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded external links, a technique often used for SEO spam or to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://jottigo.ru/123?utm_term=asymmetry+of+information+market+failure
    • https://cdn.sqhk.co/ritafase/jj9jfdS/ridikabixivovibakuliso.pdf
    • https://cdn.sqhk.co/fubafonu/ihkjejh/40446047192.pdf
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/xupekuvek.pdf
    • https://cdn.sqhk.co/fuvebopeweb/jjiahiB/jaxaliboluwesukivuno.pdf
    • https://xasedomag.weebly.com/uploads/1/3/1/0/131071243/1768896.pdf
    • http://bewepovuzif.iblogger.org/whats_coming_to_netflix_2020_december.pdf
    • http://wexixexebasober.22web.org/53484658426.pdf
    • https://jomitapekox.weebly.com/uploads/1/3/4/3/134319499/1975446.pdf
    • https://cdn.sqhk.co/nirobipodev/eCih1ue/pubaxasava.pdf
    • https://cdn.sqhk.co/kixagixupo/5lhhbfh/33660807458.pdf
    • https://cdn.sqhk.co/vafizolubev/X1igjsq/28270660249.pdf
    • https://pofemazavuson.weebly.com/uploads/1/3/2/3/132303373/79aa8782.pdf
    • https://vemosigexirapi.weebly.com/uploads/1/3/4/3/134387812/xilekilugiz-wuzoka.pdf
    • https://liruviwogaralo.weebly.com/uploads/1/3/0/7/130776788/ribebekuso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_0a8c01594ca844248576a9eaa470f1d2.pdf?index=true
    • https://3d0f0459-0d4a-4af3-8122-650a791bae6d.filesusr.com/ugd/3254bf_fc8147d195444614a41b6f54ba062e9d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e82f.bin
4c4ef32e74b035824dff1d1e5f0117470023c8350eccff5cc6e7e60013c9008e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 4948 bytes
font_01_sfnt_off0000f8e9.bin
5271084bcf5659b64e4bad78fbd4f50ccdc1c8bd39ce6970c657f887edf336d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 11584 bytes
font_02_sfnt_off00012045.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12045 4324 bytes

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