Malicious PDF — malware analysis report

Static analysis result for SHA-256 628b3d09c97cfec4…

MALICIOUS

PDF

75.4 KB Created: 2021-09-17 18:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f67287dbd137e5b0a5a826eb65ef791 SHA-1: 87bb874dbbd442fb1883b396afaaea5507b73117 SHA-256: 628b3d09c97cfec49f7e81afc2ac60ee4aba45825405969597472dda671ac5dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. Heuristics indicate this is a phishing or malware distribution attempt, with ClamAV specifically flagging it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=iquran+pro+android PDF link annotation
    • http://sjar-tech.com/uploadfile/file///2021091520474819.pdfIn PDF document text
    • http://119pump.net/d/files/87431264524.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/10614333715.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/getugetiguxut.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/pinuzam.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/zobanidevexanexasowilal.pdfIn PDF document text
    • https://luminex.pl/upload/file/25243233386.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/83288219872.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/89496418124.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/fadawigabuwijitasezajub.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/marudodameladuwise.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/52482831696.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/15080148138.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/fotuluxevowitalugolanu.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/zevegijezanudesu.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/1290479519.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210911_0A3D9B1893146D3C.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/mogizolulivawas.pdfIn PDF document text
    • http://llux.vn/uploads/files/kadoladosazisasifob.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/xivilorunanumiruw.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161323a20e03f2---5533160034.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29624805156.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_off0000c2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 10140 bytes
SHA-256: b0f3e7f577b3c56ac2583f4f2721004dbe1a364545455a78c43d5ad939aa5e77
font_02_sfnt_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 17816 bytes
SHA-256: 8f9d95b0c43d6cd41534911c24085a4061d6ab90e8f6e362545fe1f78ca6c0a5

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