Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9970d9963aefde…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 01:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2f7cf32fb918e91cfc7e65d6658e3ff SHA-1: 401f245cf867fe5dde32b40713023c33dca2d65c SHA-256: ee9970d9963aefdebf729beccc34db0c5f6f304e1e62a654b3f58a691d42d557
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the PDF is designed to host many links on disposable hosting, often used for SEO poisoning or redirecting users to malicious sites. No scripts were extracted, but the presence of many external URIs suggests the primary attack pattern is directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=pirate+bay+se+net
    • http://www.gieskestukadoors.nl/ckfinder/files/files/baxiju.pdf
    • https://adsbudget.net/userfiles/file/6644952810.pdf
    • http://www.colormotion.cz/UserFiles/file/rutanerexu.pdf
    • http://charivne.info/images/file/33493031928.pdf
    • https://securitydm.rs/slicice/file/83196268755.pdf
    • http://at2apigroup3.com/contents/files/rebutubusufumomupeposiso.pdf
    • https://susta.vn/userfiles/file/59523805780.pdf
    • http://agataklimowska.pl/userfiles/file/tataworufo.pdf
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/ziboxitik.pdf
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/zejopuwuronunizazozewan.pdf
    • https://bandotrading.it/uploads/file/71026262926.pdf
    • https://golf-tout-terrain.com/publish/page/file/nelijodikivoledabozuwef.pdf
    • http://airmon.hu/images/files/26093845098.pdf
    • http://bualuang101.com/backoffice/upload/files/56263847539.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/34636589414.pdf
    • https://hebatkeren88.com/contents/files/31152433781.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/vifiwupuxavupiwesevebo.pdf
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/36366561159.pdf
    • http://lakesnwoodskerala.com/uploads/file/71909892059.pdf
    • http://runo34.ru/attachments/file/pifawumekuk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C6 16792 bytes
font_01_sfnt_off0000cfd8.bin
0dcef2273e7aad44adde4fd18360c21e352784d22d4bd2581df162942c7ef10e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD8 17988 bytes
font_02_sfnt_off0000fec1.bin
52be6b24943e898ab9afb362cef40359268a014b36829abb00c52c3794e64aa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 10192 bytes

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