Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d2fe3b15f734e0…

MALICIOUS

PDF

94.9 KB Created: 2021-09-13 09:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83975bfaa32515ba7fd1da5bdf868681 SHA-1: 556e9d611a9fa332243004d63f7b9f9cbbb71de6 SHA-256: 99d2fe3b15f734e086cb08e393dd89f39612ea7ea213ec8a98ee571e07e7f999
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics indicate the PDF acts as a link farm, with numerous embedded URLs pointing to potentially malicious content, consistent with phishing or malware delivery. The presence of a QR code lure further supports a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://baxsporthorses.nl/userfiles/file/55793687405.pdf In PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/3458410421.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/tugufoloniju.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/86587680195.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/tijakonivenafakuxazozovo.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109041029438467.pdfIn PDF document text
    • http://taociren.com/upload/file/210912111257945376lf9ahpilfvej.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/solujebezati.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/zewedinopunoli.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/guviremosuditovuxufo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9i7pat7i0qrnhs30hn7ogje182/murowopogibe.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/3eebc014fa70b29089c7303ab9cbe8b7.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/rejewesifapi.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/jajamunurifusoneru.pdfIn PDF document text
    • https://melz-feu.ru/upload/nigazesu.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/73226593216.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/53622006202.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/sojowuvularorumufade.pdfIn PDF document text
    • http://ebus.cn/up_file/file/vawika.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/sonisorirepazisetim.pdfIn PDF document text
    • http://cabini.it/userfiles/files/nuwubobesizetuz.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/derovategutajasoxuruw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=jarvis+system+for+androidPDF 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_off00010ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE3 18568 bytes
SHA-256: 9badf7ac3ac1c33e7ab9540814f019a092381b22222017b57dc1fd01748ef31d
font_01_sfnt_off00013d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001555b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555B 10640 bytes
SHA-256: 434a278c8742e2515541d7d62c0434fa64d45a57a8196e4b4cadc459bb142f7e

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