Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd1949f3f73eaae…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 19:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0c569c872acaf98b1bf4532b332f172 SHA-1: 51026296d37864cd9bfb62cc98f6d99d2f32d958 SHA-256: efd1949f3f73eaae9e3d842888f8290a5be2d7080d8c0ba495d20679f15e4cf5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the presence of external URIs and the link farm nature strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://queure.ru/uplcv?utm_term=wav+to+mp3+android PDF link annotation
    • http://autolubitel-irk.ru/userfiles/file/vekefafewitefegituku.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210907194914.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133161e675eb---86416080866.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/96480757449.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/lisotibilegipenosu.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/xixizexuvozuvumumivufu.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/893794378.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/xipovufamenojajuxozobuz.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/67321275416.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3d4e3b27---lisekegunilidegomes.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/bafipax.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/66041865738.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/tokajononexaw.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/59577200927.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/xalonofifobija.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/72592217866.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/bovezijefilamara.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/61980065671.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/fanipamavoraki.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/55563154783.pdfIn PDF document text
    • https://svltv.in/userfiles/files/85135647486.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/difokiti.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/zeladefifumuk.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_off0000c528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 17056 bytes
SHA-256: 1a3249de8028b75d2294d1243e9745e9b555c1d22cb1d75357a4fb8fd21de0da
font_02_sfnt_off0001090e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 10440 bytes
SHA-256: 661cfd400d103f7d94159cd5ffe59d9ceab1076204c73fa65e84aaa9956ad308