Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb318d18dac0ae6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 11:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab7e713b767b0e9b64ed6926605ca2bb SHA-1: 11a5fc4533c800969a3ff99fca2fea1ac929fa7a SHA-256: 0fb318d18dac0ae6611b7d2af51eff0a66f44d3d49c874590c2275dc7e0d5067
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=road+trip+with+the+enemy+read+online+free
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/xumumavinerowelubo.pdf
    • http://muszempilla.com/files/file/waxuxifepigulofewe.pdf
    • https://kiaavcilar.com/upload/ckfinder/files/12538047402.pdf
    • https://spyboarcams.com/files/tudetipuxemololenesog.pdf
    • http://abwingsmd.com/uploads/files/paxazo.pdf
    • http://ieltsadd.ir/cache/fck_files/file/37888139831.pdf
    • http://xyr59.com/filespath/files/20210907113055.pdf
    • http://ecovn.vn/uploads/news_file/43604844116.pdf
    • https://northwestconvention.cz/data/files/sorebo.pdf
    • http://maslatalaia.com/userfiles/file/lejimasifokasajar.pdf
    • http://global-leasing-management.com/uf/file/49269581756.pdf
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/vojesewutokirogurug.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/21617578305.pdf
    • https://samsunyapi.com/userfiles/files/22641456109.pdf
    • http://glovimex.com/uploads/ckfinder/files/wukugizu.pdf
    • http://sallytour.com/FileData/ckfinder/files/20210902_C108C0F497ACC2E7.pdf
    • https://photofetimages.com/bewawevisidupejefule.pdf
    • http://perles-del-beya.com/userfiles/file/tepapovanifafega.pdf
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/kuzot.pdf
    • https://www.mds-horizons.com/upload/files/97779628126.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/31010597715.pdf
    • http://crystaltrade.hu/data/file/15666435465.pdf
    • https://serihosting.com/calisma2/files/uploads/rabozuvod.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_off0000d935.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 16792 bytes
font_01_sfnt_off0000f14c.bin
d07b65a4595a666096ba85e9e516f6f3e89cf32c1c33e1fba1bec005e7f09186		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 10840 bytes
font_02_sfnt_off00010a23.bin
07c49c752ed67b289b8b76b70dbc44b6c5ec09adb387a78ef69b8ef1759547a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 17688 bytes

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