Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3120f8dedd7b00d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-23 01:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b75f8d43729d8f98ab6234f9690ce17b SHA-1: 73def7af18165c84b24ba4c76a6ca5af84c2f77b SHA-256: a3120f8dedd7b00d3f950cb8477dec428ac05dbea7684142912c662920617c51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, pointing to numerous external PDF files hosted on potentially disposable domains. This pattern is commonly used for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kochitaxirental.com/ckfinder/userfiles/files/giwajadepavi.pdf In PDF document text
    • https://valgott.com/images/userfiles/file/naluxazanijuli.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/38b5ffb975410b33454e3029731c1eec/9282623416.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/34478385760.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/walemivuva.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/87191905360.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e121aea8d---49589534161.pdfIn PDF document text
    • http://hbaoge.com/upload/files/18376054739.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-21/20210921052256152097.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/28164367587.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/83597085643.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/77180676583.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/puzuvidetekuge.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/pomilomewab.pdfIn PDF document text
    • http://dolaninsurancetx.com/customcms/uploads/files/26182650334.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/zejaxuvokukelulemimus.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/35605158517.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/47864106273.pdfIn PDF document text
    • http://www.moyekolodin.com/files/81107938281.pdfIn PDF document text
    • https://mangallagn.com/images/file/punomuxisizejaruwetosi.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/pojunoteparojet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+unbound+gba+romPDF 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_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 18244 bytes
SHA-256: c6753687e4de03b45f0c99590bd5a29b83b344235b3797067ca8252b19d8ebd4
font_01_sfnt_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 10520 bytes
SHA-256: c79a23c5babc87ae0fd78d0fcf92b7751c90c975a40213f1967cacb75bd4a6e4
font_02_sfnt_off0001252c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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