Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d727bc59e1ab7f0…

MALICIOUS

PDF

88.1 KB Created: 2021-09-13 14:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72eba8d3c6ca9e26dffb9e7056ee0bf8 SHA-1: 221c9eb98f621b2e115a0fba0dbc8dbce6e99607 SHA-256: 3d727bc59e1ab7f033ad939960b53e4d3fda519fc85665c3bb9c4dd9be4d9bc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external PDF files hosted on various domains, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.hangmandigital.com/files/file/zulujimonorolid.pdf In PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c863e20ff3---zalirepikewuxurigajaluv.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/89845420713.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/54691028251.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/57532829806.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/75806911867.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/85102452971.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/45752481122.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/29967856710.pdfIn PDF document text
    • http://falconltd.pl/cache/file/bizikowoki.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/92581839806.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/sujad.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/xorikusoro.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/29305922733.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/zelokov.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109071255574654.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/9100124160.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/33958450994.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/11603819043.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/88180194368.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/0ahivhu6n199e417cbk9t7fiut/43390297231.pdfIn PDF document text
    • http://www.moyekolodin.com/files/3611824952.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/2190225790.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/dunupivakalakolewuk.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/43830262160.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/gajimoneziva.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/jixipabifefup.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/90809969209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mi+10+vs+redmi+note+9PDF 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_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 10604 bytes
SHA-256: 1daff8e4700d0d3a9bad5a22665a55cb3d7f0bab7ba1d08bdea1c615824a6757
font_02_sfnt_off00011de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE4 19904 bytes
SHA-256: 98580317309424e86a2fd31866e669ce261b1c3e452a1d7acc063826ec8c9d58