Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e5ac7a65749abd…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 01:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d318d8db3f3c176460a14422e18240ce SHA-1: 7f18182ba099dec8c3c5c4587d23be6c9198be39 SHA-256: a2e5ac7a65749abd4e701d95abe545dbd5f975aa34646fe5eb7805ff15c27d1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a link farm or redirection mechanism to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a strategy to distribute links across disposable hosting. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://www.aledrukujemy.pl/ckfinder/userfiles/files/wimej.pdf In PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/kadatoxosis.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sunokifegasubidunakuj.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/kivot.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/37137446769.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/lelikojupi.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/tezesilajoziv.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109081054046522.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631398656_1191391126.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/5569491748.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/xuxelulapufetab.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/mekine.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/zizotokekekepiber.pdfIn PDF document text
    • http://htygroup.com/upload/files/75575907996.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78f04f3fd---genuxofelisisa.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/52891095691.pdfIn PDF document text
    • http://retailcop.ca/files/14762912158.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/nedofuriluduse.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/54513127610.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210910190619.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/sorusuvigupajunize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+browsers+testPDF 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_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 10240 bytes
SHA-256: 3f86f99224003bfefef3477915e3951d2ccd4b3c3262cae1bc6101c8c7b42a03
font_01_sfnt_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 17696 bytes
SHA-256: 56293eb54e3cdd479552161f812580fa0505d291c45cbbd8c87bfc1cbdcaac7c

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