Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa667fd6b13a526e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 08:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06f15eb87b6cf2235777567b67f21c44 SHA-1: 7282079940925fb526371cc00000aa57d700ac57 SHA-256: aa667fd6b13a526e8a5b0e67c04054c46be144c6900636fff02161e2942a48bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to link farms and disposable hosting suggests a phishing or SEO manipulation campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://parkingparts.com/Upfiles/file/wipimuteg.pdf
    • http://phantasos.org/userfiles/file/66145059092.pdf
    • https://ckmandarin.com/uploads/bofanukepuvekotifebi.pdf
    • http://intertravel.hu/_user/file/melapejasuxibetof.pdf
    • http://riverla.vn/uploads/userfiles/file/49852118163.pdf
    • http://www.smwiarus.pl/ckfinder/userfiles/files/70517699354.pdf
    • http://zsdbiopharm.com/upload/files/kuxafobimitaxuregix.pdf
    • http://fortwashington.abwingsmd.com/uploads/files/41815008095.pdf
    • http://cpviettin.com/upload/files/punekerig.pdf
    • http://getsolarnj.com/userfiles/file/puxanepopabunowerejutiju.pdf
    • https://ycb.one/pro_pic/files/tuvovaka.pdf
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/repigegozavana.pdf
    • http://mulroyenvironmental.ie/userfiles/file/kazasaxedotidinit.pdf
    • http://bowie.abwingsmd.com/uploads/files/fopubepozezin.pdf
    • https://wanna-drive.nl/files/File/65947635170.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/62c557d81ee933168d0072eff0f292cc/kesuvodo.pdf
    • https://kiaavcilar.com/upload/ckfinder/files/27657566148.pdf
    • https://eletmodguru.hu/files/files/20409142143.pdf
    • https://benhgout.net/uploads/Files/file/fikewefazojiwima.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-9-4/20210904051233106897.pdf
    • http://kfnmsz.com/upfolder/e/files/20210913044654.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+play+xbox+games+on+android+tablet
    • 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_off0000e39c.bin
59ffaed741cb5f35d6d1767219688d67845f66e535c7cfbbe9179703c6b81982		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39C 18224 bytes
font_01_sfnt_off00011247.bin
c92b200c9396d91f08a3762b1983b6f59be0b1818a0a282a2c82dce14e72f4d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 11168 bytes
font_02_sfnt_off00012c04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 16792 bytes

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