Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb0ebdc93ca5435…

MALICIOUS

PDF

86.6 KB Created: 2021-09-13 01:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03cec920ef427c45e1ac277042c8d19d SHA-1: 5d52bf69c59073975614e28e1c2fe78cc7dda0f2 SHA-256: 5cb0ebdc93ca543505b52e03bdcf4376fb278e644da450534d5c0d7cbfb216db
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to other PDF files, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, identifying a pattern of linking to disposable hosting. No scripts were extracted, but the structure itself is designed to lead users to potentially harmful content.

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 http://marchmont.ru/imgs/file/raxiki.pdf In PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b43d0709f---xoxipajitakidugezezipe.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/61579298502.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/c271f06513a56c73da992e6f8c2fc08c/pugowulen.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/33812214799.pdfIn PDF document text
    • https://novitas.ro/files/79851378354.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/zatipetuwikuwim.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/zomivuzozode.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/pomudadodikan.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/65853161814.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/lefeposoxazepafamasebogip.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210909_152709.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/jegomalalidasukazo.pdfIn PDF document text
    • http://nemalipics.com/77268859466.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/50334410857.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/gifazudima.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/31364988939.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/95701411132.pdfIn PDF document text
    • http://idroter.org/userfiles/files/70239294672.pdfIn PDF document text
    • https://digireg.se/upload/93705502418.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/14619414813.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/bumaxodegavorima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=imo+apk+download+2021PDF 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_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 10384 bytes
SHA-256: 8b367d917f1b956c97ad1202a3b3a0df53882623c12435fbde569a3d6f124b1b
font_01_sfnt_off000108c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C1 17036 bytes
SHA-256: 814ae7d38a22b1c29195092a63fe91ce1c5abc34255a0d535c10e2a8f114e093
font_02_sfnt_off000134c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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