Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6db01fc4fc79b3d…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 09:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c781b79c99e3e402bb276e363b81ba0f SHA-1: f2a7ea1b408c21b7ec87652ba5eefbd667a62f26 SHA-256: f6db01fc4fc79b3d3b34e801cdad25eb4be6df2aa9a1ac90da35ea5dd09e5deb
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded links, many pointing to PDF files on potentially disposable hosting, suggests a phishing or link-farming attempt. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for execution, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.badischer-kunstverein.de/ckfinder/userfiles/files/76602451226.pdf In PDF document text
    • https://airin.lv/images/userfiles/file/59363346359.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/tufodumirowi.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/40784415133.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/fedesovifidokawodabuzotu.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/92623545660.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/vekidepewivuso.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/5308205307.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/xutik.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/44277377641.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/jitige.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/budikoviwalozezugelipi.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/56151249049.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/vudozazogafurixa.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/83155742886.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/jinasabusamupujuze.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/tositovipovaneluzogotu.pdfIn PDF document text
    • https://icbacademy.com/upload/files/nomibuxupilodavozib.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/45983619453.pdfIn PDF document text
    • https://stormester.no/files/file/sasimowawinuwevul.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210912231216.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/kojazobijokozagadimulolew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=aplikasi+penyimpanan+foto+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_off0000d197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 17100 bytes
SHA-256: 2251079d11a14e89db08ec8a67491f99c1c901e42bc53b04f69f6845e41d8761
font_02_sfnt_off0001166e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 10848 bytes
SHA-256: 6c9ef90eddf2bdce0d5ca9fcaf51678f9142e777b325edfbc915cbcd01b56ffc

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