Malicious PDF — malware analysis report

Static analysis result for SHA-256 27811b66d27b7b59…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 13:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 500e9588aef5ec5468c84919757d4ba4 SHA-1: 7cb64f2cae32da8ecdbb44be5bb2a4ff8ac5fcc3 SHA-256: 27811b66d27b7b59645bc61d64fa2c594b2b33a4b474faf47196d5b10d844e65
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://garglob.ru/uplcv?utm_term=hotstar+apk+latest+version PDF link annotation
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/sobivogizozojolamupapev.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/98488010063.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/8071852101.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/98143983340.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/95828941263.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/19203032518.pdfIn PDF document text
    • http://www.heksan.com.pl/file/51170467231.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/21058285933.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lapotuwufokeloral.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/wemuva.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/44878477042.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/54784914122.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/mevideb.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/74701141833.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/72787306987.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/39003397928.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/51004758649.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/13887900715.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/24860033883.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/50585304267.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630599382.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/juzadodisidazigudonuvezag.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_off0000da59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 10392 bytes
SHA-256: b6e0e0bf0f97570d6e4d3e0c58bbc4ed1b5460082dc89189e7dce0338378068e
font_01_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 17716 bytes
SHA-256: 179a34ac815a3acd99c631bd52930e06e801616af1c51e3cbefdb9d61d4abf4e
font_02_sfnt_off00011fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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