Malicious PDF — malware analysis report

Static analysis result for SHA-256 769881084c85c5c1…

MALICIOUS

PDF

63.5 KB Created: 2021-09-10 07:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21532fa3921b1e4fd9ba35d0bab54602 SHA-1: a6ef2269a5a9b2219011e13e95569f0e81e1fd40 SHA-256: 769881084c85c5c19e296c6861b62af1a54ca157de122db4cdf7595ecf5776f3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be disposable or low-reputation. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm on such domains. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6817

Heuristics 4

  • 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
  • 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://softwarefactory.nl/images/file/dakowutekozabukavuva.pdf In PDF document text
    • http://greensketch.in/userfiles/file/76640999532.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/13758799632.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/33811312958.pdfIn PDF document text
    • https://autoskola-scp.com/files/suxewufemox.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/75779876013.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/lixegaxavutidixaz.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/jetelonigadenalegigit.pdfIn PDF document text
    • https://vontobel.shopbyeberli.ch/userfiles/files/fuguxojepinigijimul.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/zoreporub.pdfIn PDF document text
    • https://shibbirs.com/media/files/80273977728.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/22413298705.pdfIn PDF document text
    • http://megalaserasia.com/upload///17188705845.pdfIn PDF document text
    • http://epicridesnepal.com/files/kewijedokepatulubuxumute.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac62bf372b---25626333768.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/18769993446131783b778eb.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/o4q86rtc16a74qmmj0u8vetcok/tezogadiladoso.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109091415294065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=locus+gis+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC556 10220 bytes
SHA-256: 3b90ec42606cd779f8e05d127c8359d75f21b2943726db721b79d710832db7bd
font_01_sfnt_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1