Malicious PDF — malware analysis report

Static analysis result for SHA-256 4932f20041f20462…

MALICIOUS

PDF

107.1 KB Created: 2021-04-20 05:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c794f228b14425b3fb42d75f1e027508 SHA-1: 961722408e84ede3ea21d78dc28ab245830e4e12 SHA-256: 4932f20041f20462eaca7ff498da29b0e09a494d80984c60e0bd7bac42f954c9
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, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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-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://zajinet.ru/strik?utm_term=funciones+del+sistema+endocrino+en+ingles
    • https://tawatoxox.weebly.com/uploads/1/3/4/0/134018263/tijakisekik_jevez.pdf
    • https://cdn-cms.f-static.net/uploads/4410201/normal_604e6ff573c7f.pdf
    • https://cdn-cms.f-static.net/uploads/4498978/normal_601e14de9381c.pdf
    • https://static.s123-cdn-static.com/uploads/4403410/normal_60026e8f98614.pdf
    • https://cdn-cms.f-static.net/uploads/4426953/normal_5fe88eb47728d.pdf
    • https://cdn-cms.f-static.net/uploads/4383334/normal_605b7dbae13e3.pdf
    • https://cdn-cms.f-static.net/uploads/4416514/normal_60388b72a0d3f.pdf
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/a8ea6ad.pdf
    • http://rotepojisox.iblogger.org/bollinger_bands_rules.pdf
    • https://cdn-cms.f-static.net/uploads/4371505/normal_606aa66cc4c2c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vawoxifi.epizy.com/activated_sludge_process_design.pdf
    • https://uploads.strikinglycdn.com/files/1a2bc81e-cff7-47b4-8e7c-3b010c3c6323/10904760021.pdf
    • http://kubitilabevovup.rf.gd/t_shirt_template_free_download.pdf
    • https://uploads.strikinglycdn.com/files/168a8d46-ca0e-4380-89f4-6f3f2c1469b0/himno_nacional_de_honduras_y_sus_estrofas.pdf
    • https://uploads.strikinglycdn.com/files/e1e17def-65f2-4dd5-9325-ee3fecf1152a/74666751089.pdf
    • http://sogefotatuledis.epizy.com/brown_eyed_girl_guitar_chords.pdf
    • https://uploads.strikinglycdn.com/files/0af94e57-d993-4fb2-a8ff-abf616df096f/kexabugukazupanej.pdf
    • https://uploads.strikinglycdn.com/files/f31dcaf2-68d7-4542-a3b3-56bab1ee6728/94405803786.pdf
    • https://uploads.strikinglycdn.com/files/8ebc6c36-b4d9-4e74-be0c-702c2e93e7e7/far_from_the_tree_documentary_summary.pdf
    • http://fokekamunedas.epizy.com/xitipiwofux.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_off000161c3.bin
f16c5bd4bacf611687c9802847987c36fa097692538452c36842c37f38046676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161C3 5216 bytes
font_01_sfnt_off00017364.bin
1d0ccf8ca583c5b967adf2bf135ffec0fe7713c1e89ea7c9905de6fdcd0a2f35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17364 12804 bytes

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