Malicious PDF — malware analysis report

Static analysis result for SHA-256 d705761fb1f807ea…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 02:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 36db038ce8318dbed3e097369a1e3da7 SHA-1: bda455d8b1685474907313ed6564682c70dfdada SHA-256: d705761fb1f807eaef10967ed56b1c7ddd4f9f5c3577ea289f98157d6fad16d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the PDF is designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=best+minecraft+pe+addons PDF link annotation
    • http://chipublichouse.com/ckfinder/userfiles/files/20521995821.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/vosobisukitotiza.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/56587063181.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/serakananekufaram.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/90097160710.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/koguzimineguva.pdfIn PDF document text
    • http://osayit.com/images/file/pezolozatebami.pdfIn PDF document text
    • http://schokofontaenen.de/idata/29968024629.pdfIn PDF document text
    • http://hotechike.com/files/files/wexiverunisi.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/wurenodibilus.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/wisuwivobuwijaranoladokam.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/wuvenexuvejanorutokegivew.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/wipidurumoj.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/xaludiniwoxu.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/vuzuzifanazetifonok.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/28838947575.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/79084905675.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/bisurotikaboniramaxute.pdfIn PDF document text
    • http://labonscafe.com/userfiles/59492733298.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152ec5de6f3d---bomalaw.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/74274890052.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/16095611346.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/kamimuzokozefusopoz.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_off0000b14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14B 10788 bytes
SHA-256: 7f258cbe956ae2d50bf24b463fcea4b5bd047fde5f425ac54d8f54af81fadf11
font_01_sfnt_off0000ca1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1D 16076 bytes
SHA-256: 63a49aec3713913709b94f0c6c5c827276712bc2cf5d401f732f69de17072249
font_02_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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