Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1c8eb818187c2c…

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 20:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce0cd5e6b3dde0ccb33a0f80e215c073 SHA-1: c5cf02f5bd6915b15240ae13b66a3ed6230b98f5 SHA-256: 7d1c8eb818187c2cb269410f5b9bd93cb94652541cc916ce35bca7e02b0a8e7f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are disguised as download links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/ropawisidakaribazu.pdf In PDF document text
    • http://tahyuh.com/uploads/files/202109130532419152.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091617232_367384461.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/50728549916.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/82911805464.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/57895504591.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/84505577609.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/mumopadej.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/67942096949.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/40060472443.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/37279837647.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/25068047130.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/sanedesatusoxalilivifo.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/kitapijudovirapotilalen.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/paniluwuse.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9281c110---87700631155.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/waromufijugetarug.pdfIn PDF document text
    • http://lg-palette.com/upload/files/67056072564.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/bameturu.pdfIn PDF document text
    • https://blugarden.eu/file/43317688629.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/zosopa.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/dc97d06eadab159ad87f41ff9c422f4d/nefobugironekukaniludaw.pdfIn PDF document text
    • https://abss.pt/userfiles/file/21998964432.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/kibinalorupegedokegula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=wwe+champions+apkPDF 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_off0000c4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A6 10564 bytes
SHA-256: 53d1978a26cd681a16ca1ac928965356a003381cdaba6f5078dcb7e3c8606566
font_01_sfnt_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B3 17492 bytes
SHA-256: eeb450a28e1e7483cf4f37e3a016fb35191b105ab8e3e2a692b2c6b9c8ca1478

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