Malicious PDF — malware analysis report

Static analysis result for SHA-256 01bcc3231a543ec2…

MALICIOUS

PDF

98.6 KB Created: 2021-09-17 05:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa20513d02c170b94703c0eeef7af84c SHA-1: d669c224dfea4af2ff0562baf22d4ab8b8ad4b4c SHA-256: 01bcc3231a543ec2f74d67ed005f9b24ae7258f914b08834627f126bea3abeac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous external URIs and is structured as a link farm, suggesting it's designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613baec714610---12129997492.pdf In PDF document text
    • http://feuerwehrobrigheim.de/upload/files/dotifuvo.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/36996296781.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/72690434915.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/89546629075.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/dexibuviruxedu.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/8086138321.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/48058976160.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381b2e98da9---67888864411.pdfIn PDF document text
    • http://guitarenko.fr/img/files/92284557158.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/13999731517.pdfIn PDF document text
    • http://baoveantam.org/upload/files/39666222073.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/dodopug.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/73643044100.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ad70393d53ab20ebf4234a6fe97b3a33/44039299446.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/wokalorawu.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/82147572471.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/logugibuzexukuzikalofere.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/buzalopixonepofudurafi.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/36037675271.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/30621983611.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/kesujid.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/fenabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+cleo+for+gta+sa+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 19024 bytes
SHA-256: cb28835c281fc7eb36d33323b1a19370f039c028fce1c990c059fe5a918108b3
font_01_sfnt_off00014bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163F5 10736 bytes
SHA-256: 3114f21d5f254905c2c179f17b12591204a4c08659f6123e306bfdc0c151d3cb

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