Malicious PDF — malware analysis report

Static analysis result for SHA-256 55db2b6df4df3ae4…

MALICIOUS

PDF

74.9 KB Created: 2021-09-11 13:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 4c4a733f1f7cea9aa0f2201895429edd SHA-1: a06173a6d6186dcdc79bf42971ae722202a61882 SHA-256: 55db2b6df4df3ae43830750caf146a490b2d95ada0a87fed3c3d5cbf32e36aa7
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating it's a link farm designed to redirect users to external content, with one URL pointing to a raw IP address and another to a disposable host. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely phishing or malware delivery. No scripts were extracted, but the embedded URIs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3852

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://laborke.ru/uplcv?utm_term=embed+generator+bot+discord PDF link annotation
    • http://petra-koparki.pl/Upload/file/jovikiwilajadesosirukap.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613300a93465e---13276069402.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/97071951652.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/2938331585.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///vexavasatus.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/gutew.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/xasutadapatazozep.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/furodig.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/bozulefegulevebupaso.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-3/20210903183330253508.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/55229654980.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be499c8e5b---kosizixigolujibazidovox.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/37120591200.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/narabiwubotajugasebef.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/60980772761.pdfIn PDF document text
    • http://precisao.org/files/files/9838650872.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210905030202.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/17202026892.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94466803866.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/86482989421.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/81348158152.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/niralibepuvuguvib.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/37654690631.pdfIn PDF document text
    • http://malifer.hu/upload/file/torizanoxotovibivix.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb9efb1aa3---35548975618.pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 18464 bytes
SHA-256: 4e45cd36fc3aa28a464e3ffd298293f4a9bd2c45a13df5122f52be15c07a6583
font_01_sfnt_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1