Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf49cd88f03e34f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 19:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25478b17d81780b3c4356a038dd42cc7 SHA-1: 10d2f1809a68b42482eb6ed0611e71687458f207 SHA-256: bcf49cd88f03e34f3e59b5cdf4a13bd08aca06f626a8a8708d061c7e804f0a86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for SEO manipulation or to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://thaisomboonautopart.com/userfiles/files/46842973691.pdf In PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/zazax.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/5509496869.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/67964372761.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/80623422358.pdfIn PDF document text
    • http://synowka.pl/galeria/file/61559107472.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/gobujejejepepigiru.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/sadupijunixafofer.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/badof.pdfIn PDF document text
    • http://xhzhengli.com/upload/61604090114.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/bewerasoveguv.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/ramujo.pdfIn PDF document text
    • http://abworder.com/uploads/files/logodovuvirivojuduva.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/49540623407.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/jutininovugawojodexarofor.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/pukok.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e79409a676---54791035759.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/4542734474.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/piwebinin.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/31335648282.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/gotutiwaruxof.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/42929082441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=free+comic+maker+websitesPDF 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_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 18164 bytes
SHA-256: bacb122c54ad020fd349202f43d60baacba953ad96c2278781526282495c3c2c
font_01_sfnt_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 10536 bytes
SHA-256: 4eee2ea2ba73600c74325fe0e3c43e1502209573e14b4d935ab423bba02f3064

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