Malicious PDF — malware analysis report

Static analysis result for SHA-256 397738b752a98660…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 21:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1a874f4dbed675c8025c1a4a5899ad8 SHA-1: 4901eff44dd614b208409f7f25fccd1ce5c856e2 SHA-256: 397738b752a98660e550e7bace178dc8c959ce4fbe0e0adc84f8acb2afa6f79d
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, with one specifically identified as a link farm on disposable hosting. The PDF's structure and the presence of these links suggest it's designed to redirect users to malicious content, likely for phishing or to download further malware. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vmwarts.com/ecovic/file/dojoxavimoxulerijemal.pdf
    • http://tokstar.com/_UploadFile/Images/file/29875281849.pdf
    • http://sarkar.ie/userfiles/file/5613614292.pdf
    • https://www.babetravelling.com/ckfinder/userfiles2/files/lagixazave.pdf
    • http://abyss.sk/userfiles/file/samipimikojad.pdf
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/jesatelegiratibufipe.pdf
    • https://fengshan-zhennangong.org/upload/ckfinder/files/93107507868.pdf
    • https://datatech-int.com/userfiles/file/fusibujoruxazupolino.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130654b62caf---poxovifikosirijene.pdf
    • http://bfttacg.marketsearching.com/upload/files/sasumezemadenapumemew.pdf
    • https://alistairmills.com/ckfinder/userfiles/files/mitakulalalezoxi.pdf
    • http://vinhomeshaiphong.net/app/webroot/img/files/vomip.pdf
    • http://tl-maskinfabrik.dk/userfiles/file/89825550493.pdf
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/wesebon.pdf
    • https://maintogelonline2.com/contents/files/84203681441.pdf
    • http://stamforgtechnologies.com/uploads/12243438952.pdf
    • https://girisimhaber.com/uploads/file/jukiz.pdf
    • http://onlineticketreview.com/images/file/sositopolaletokexowo.pdf
    • http://ranchobg.com/img/file/nufusukaz.pdf
    • http://serdceprirody.ru/userfiles/file/34545488589.pdf
    • https://markyatirim.com/resimler/files/2015558239.pdf
    • https://k31szmq42-nu28.com/contents/files/79624225107.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3de7d72e2---tudodowutufa.pdf
    • http://brickform.cz/obrazky/files/14666705977.pdf
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/13359799682.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pc+play+store+download+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a5.bin
7096adee3deefd3eb0682cb98ec0b4c53bcb8ff0d020c30fc695061b97fd1193		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A5 16604 bytes
font_01_sfnt_off000101a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 16792 bytes
font_02_sfnt_off000119bf.bin
f7a1a34ac2df75b79c23ed4e0658ec13214701a881d873d35d57ec76c7a46267		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 10708 bytes

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