Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f807d6cb1a81b5c…

MALICIOUS

PDF

90.4 KB Created: 2021-09-19 07:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 83a6a39d9277692751006163a59acd23 SHA-1: 1b9db35b1ccee46867f60db5b1f55000cbb326ba SHA-256: 6f807d6cb1a81b5cc868fb7bcd57361ca6b1fb9637d1c5e7949d504736f996f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The presence of a `utm_term_redirector` heuristic further supports the idea that these links are intended to direct users to malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://zenit-npk.ru/files/file/bosuverumipogutisa.pdf In PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/walibed.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/56916913843.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/tivijovif.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/supotavenetadisa.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/lajekuriselanuxisoj.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210908183257.pdfIn PDF document text
    • http://cbstav.cz/file/lozedatudeto.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b026049cb---23617108950.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/36992622441.pdfIn PDF document text
    • http://safetruck.gr/images/file/wadidif.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/27293548420.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/18619187894.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/812065571.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/81216015365.pdfIn PDF document text
    • http://kvrhousing.com/uploads/75924719703.pdfIn PDF document text
    • http://gyliver.ru/files/files/wetamijerabenu.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/migokesizotefakan.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/josarifa.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/60115476249.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/letuzusifopijoredili.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///57242321097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=iphone+price+in+bangladeshPDF 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_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 10784 bytes
SHA-256: f54ebbc51440d9a507590410c431c6adf27449126c8034a53cbf76000d2b3e71
font_01_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 19120 bytes
SHA-256: e31674750fcf562b1ab09494bd14e26290d4453c13af4fc40e685abc21e684ac
font_02_sfnt_off00014416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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