Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d20c904ae3b8f8…

MALICIOUS

PDF

75.4 KB Created: 2021-09-17 14:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b963cb5d396ddbe775fb3693e4db5b9 SHA-1: c8f1a5c710c3517568c5aa59ffeb9966691aae77 SHA-256: e7d20c904ae3b8f8dca272fed0365eadd9af30b9cb7553a74965f80fa736c0d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on external domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML detection suggest it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://orderkiwicafe.com/uploads/files/zejalafodenepaxirozegad.pdf In PDF document text
    • https://shellserva.nl/docs/Image/file/93475578084.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/19401019420.pdfIn PDF document text
    • https://music-group-store.com/upload/files/koduwojunoreparu.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/vetinafutororefebanid.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/23493199484.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/xoposixowubi.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/36859110442.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/93011595866.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/fubonunibigodefifenad.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nopuwopumetafojewina.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/winugodewi.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/batigakaboridiw.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/lidawusigedipex.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/mibiwojepebowinanixilat.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/24305294655.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/kemikomijigoximo.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/tawusipagugogasexodeb.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/60145871498.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/gezagokunabi.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/30640572123.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161424d61e5139---fitusenivikupuvabura.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/21685685660.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/budemeruvapetikupup.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/32900825008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wheat+montana+menu+kalispellPDF 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_off0000c3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A7 10604 bytes
SHA-256: 4d2b1b54dba3495660a3892de70d9a23b599017f8fd75de896ff9edde7ae99e3
font_01_sfnt_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 17180 bytes
SHA-256: 382728f37f108e1a1adc2da2194bf26c1ad9f5a25aa0dae4f268b608bdc2ef42