Malicious PDF — malware analysis report

Static analysis result for SHA-256 510736f806836a96…

MALICIOUS

PDF

79.2 KB Created: 2021-09-09 18:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 8a68fc840cff3bac8044b66aa48bd519 SHA-1: 04b3195a39940d0f280b3079cee100ae87261d5f SHA-256: 510736f806836a96c5058ea9c31de2777757d863d0a81b6094de78f754c2d13f
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 distinct hosts, which is a common tactic for phishing or distributing further malware. Although no scripts were extracted, the embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://buren-kompanie.de/userfiles/files/874803441.pdf In PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/rafekufusajew.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/84256317249.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/66893042383.pdfIn PDF document text
    • http://taxfreepoint.com/file/54275817829.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/lujovafikatigosigeti.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/6819909523.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/33230538747.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/teramabopotofed.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/2908637192.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/busilu.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/puvawoxidakazulegenuwa.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/81021784712.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/38057895004.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/73617915446.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/86664026252.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/58397230277.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/pisoxewedaga.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/lazuboworarodiwakusix.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/tujexadopufarijufejuvepu.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/1983058961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gameboy+super+mario+land+romPDF link annotation
    • http://elezioni2014.gds.it/userfiles/file/mewamasuvek.pdfIn PDF document text
    • 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_off0000d10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10B 10848 bytes
SHA-256: 550ee8f2095435c1868ae344f84757e6a5d8b78e3c374ec489dbe54e5f1557b9
font_01_sfnt_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 17464 bytes
SHA-256: b8a1e5ff77277335e236d3e5a7099280731345d066d6947ca4e7d2856534360b
font_02_sfnt_off0001170b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1