Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab961288ca2f7cf…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 17:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a823ed464fb182ab539b6b974eb9e6c SHA-1: 38491043919f6cee10e7d6d616490fb4a89da83d SHA-256: cab961288ca2f7cff6d1493dcd3569088fe06d3b291d72a8d3afa0a7525b3e0d
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of many unknown reputation URLs suggests these are likely used for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://www.dfdtrading.sk/ckfinder/userfiles/files/81004380754.pdf In PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/87362341476.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/20039509907.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/60752380918.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/020939253443.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210902_1E70C567E934F602.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/jakosorixa.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210912045136.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/94970660587.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/8295907435.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/84511435657.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/valopamonivexotetobibu.pdfIn PDF document text
    • https://tcremich.lu/files/files/83033416004.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/40167507474.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/4515937263.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/54490110634.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/8718729466.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/86741716861.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/kepubeti.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/zusefelujoxa.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/54072718095.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/3565466551.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/78375313558.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/laxamufixipebebopa.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/zaxasifokesug.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/togoka.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/rowutevuguw.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/mutakudisoxejenojewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=facebook+chat+headsPDF 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_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 18852 bytes
SHA-256: d28cf919051f1a9337326edecdb3c17276f68dc1c570863a86043149faf37c15
font_01_sfnt_off00011428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 10332 bytes
SHA-256: 908d27d4a29c01e727af58e5e99b32bc34a55e815f6c4d5e39797ab6c5537c43