Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9a0c69902f5493…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 18:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39a1072e74c1a1b8bd624dd8b2d9fe48 SHA-1: 4c4519df72943ae2419073ad02a0dd11c0de215f SHA-256: 0a9a0c69902f54935daefba0f0a163036e837c57699a3f08ecd8cbcdf9dce157
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or content distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the document's purpose is to manipulate search engine results or distribute further content. No scripts were extracted, but the presence of multiple external URIs is a key indicator of its functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://handgun.ee/media/file/rered.pdf
    • http://ashioke.com/images/library/File/86262410803.pdf
    • https://sofahatinh.com/upload/files/96161738385.pdf
    • http://flomojapan.com/upload/files/riwalagewadixelazi.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16138ee8b637c5---64832237746.pdf
    • http://alnadaoil.com/userfiles/file/pigafineme.pdf
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/wapixifegegifone.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/jijelur.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/turunaxonizorejazopejof.pdf
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/luxitadobazunaxur.pdf
    • http://yoshitomo-kokubunji.com/jcfiles/file/meludepaxewirib.pdf
    • http://thaihotelsale.com/FileData/ckfinder/files/20210910_C3A1CA938B8BF16B.pdf
    • http://www.lircai.com/web/inline/file/xufeki.pdf
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/7983514324.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141771e4c4bf---nuxolu.pdf
    • http://epilia.com/upload/FCKEditorfile/11924263688.pdf
    • https://balarampurblock.in/ckfinder/userfiles/files/67654824980.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/66141268800.pdf
    • https://alhasooncorp.com/Files/files/zigedijekegebebokupel.pdf
    • http://askaudit.ru/price/88024961401.pdf
    • https://www.parcdelorval.com/ckfinder/userfiles/files/rogesiwobamekufemaxawuwo.pdf
    • http://shangrilatheshow.com/ckfinder/userfiles/files/fekufixejolanijanu.pdf
    • https://autopsrus.com/ckfinder/userfiles/files/lazobazotosajeredufuko.pdf
    • http://finara-v.com/file_media/file_image/file/18069119174.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=flutter+sdk+not+found+in+specified+location+android+studio
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D7 16792 bytes
font_01_sfnt_off0000dbe9.bin
7fa5fb2b81f4cd9b053ef7b535cfb90fdefe381be374b4fdac4a2907d79128dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE9 21172 bytes
font_02_sfnt_off000111bd.bin
f15322d8a1ab36f028a5350d636c53fa1dbc8e6a8ccad19ef2792552e9879471		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 16600 bytes
font_03_sfnt_off0001293d.bin
bb1a2683f589ae595e20502f9c4358c2df2b7e47ed90469c950b9e2970305c30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1293D 10784 bytes

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