Malicious PDF — malware analysis report

Static analysis result for SHA-256 607075333d0bc7f9…

MALICIOUS

PDF

78.5 KB Created: 2021-09-24 11:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e30fa700783dda6bf909b009b84c8ef3 SHA-1: b6696b14edc230ef660cbc910c9a4a3ef6b800a5 SHA-256: 607075333d0bc7f9ea576fdb08d377c08de94139aa25663ad91eb087df99e98d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous embedded URLs pointing to external domains, with one specifically using a UTM term that suggests a lure for software downloads. The PDF structure and the presence of multiple external links indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=temple+run+windows+7+download PDF link annotation
    • http://danbikoreansj.com/uploads/files/mimoriwerulutek.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/76332377812.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///33246869622.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/gubuvitinajelajapufixuk.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/vozif.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/10370251285.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/roresonide.pdfIn PDF document text
    • http://lilcash.com/ckfinder/userfiles/files/94796695037.pdfIn PDF document text
    • http://napiarsaigh.com/images/42456841717.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/duxajabazovedez.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/gebuzugorerosit.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/57564502832.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/jiturulukavofuxabu.pdfIn PDF document text
    • https://emmaushuis.org/pages/39937767954.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/651c4c169404274782e9de67af85aa28/zonezujififoponezuzem.pdfIn PDF document text
    • http://nairmobilya.com/userfiles/file/94640593334.pdfIn PDF document text
    • http://szpk.hu/_user/file/91615447704.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/wimikusilazop.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/23385521397.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/nefopoloroxedevejevaj.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/tusedulusulerilisebuwowo.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/24690055708.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/xigerubufug.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_off0000d05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05B 10652 bytes
SHA-256: 75c27074ca3f501da0faf7cb4a4995cb41924095f199b05b66a0bdf03963c786
font_01_sfnt_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 16852 bytes
SHA-256: f7ea300372e470f65a280e4742c899469557f8ca69f9b9da816ad6c49af7ee10

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