Malicious PDF — malware analysis report

Static analysis result for SHA-256 0868efca77a03ec5…

MALICIOUS

PDF

89.2 KB Created: 2021-09-08 18:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5b6672bdfad9d8acb2758a9cb7800b1 SHA-1: 773daed96cf67fbadbd3dda11dc7dd0d00e99f6f SHA-256: 0868efca77a03ec5786ef2ad38d773cd85d13f36413bb2139d1e14ac839d778b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm and potentially a phishing lure. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely for phishing or malware distribution. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://hexema.com/FCKeditor/file/takeve.pdf In PDF document text
    • http://drsuthichai.com/userfiles/files/63630885828.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/38969323012.pdfIn PDF document text
    • https://pellevah.com/upload/files/voparujiterolisujezow.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/pifipiserilogaxixabo.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/8442832669.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/tomed.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/86297856176.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/jadagupogozo.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/49292748724.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/90441551204.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/kumezivepalitekepunumasu.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/minulapinokogoguwuvoti.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/66988743033.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/lijepinewedowiru.pdfIn PDF document text
    • http://hidropro.hu/upload/desegiminoguvagotovazupas.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/84554034365.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/muxibetexopewuroduzoguser.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/rovegirofu.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/477906887.pdfIn PDF document text
    • https://sambelteri.com/contents/files/48221705718.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136777f221c8---vumajifarezozalavate.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161378dd798eae---lixijitumalemokejozada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ley+de+impuesto+al+valor+agregado+venezuela+pdfPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/gevopakuj.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_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 19860 bytes
SHA-256: 3c7911224ed695159902e77636b9029a13f0fad19e171e64b287d9f85682efe4
font_02_sfnt_off00013d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0F 11136 bytes
SHA-256: 1a14d5a71e0116a6fa744f945fd2e34260ae73cb941054cf5b06bf015786ff5d