Malicious PDF — malware analysis report

Static analysis result for SHA-256 b031224890e0780f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-14 03:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24c43f05edd2a11273b2cca68e7ba161 SHA-1: 7de9d5cde55f9e65abd98569cabaec672f9a97f8 SHA-256: b031224890e0780f9a94fe787cd5823a172560eb49dbbda50c2bad3b1ab6644a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, with many pointing to potentially compromised or disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating an attempt to direct users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://fuku-zou.com/userfiles/file/33486687801.pdf In PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/84751647063.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/revoxekaw.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff6717887e---kojuf.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/51414821495.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/fokatebadapa.pdfIn PDF document text
    • http://centronegozi.com/public/78378258506.pdfIn PDF document text
    • http://shamayachts.com/upload/file/4071769754.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/zexopetatigokoxexibi.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/daviratokijizu.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/migez.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/29527534528.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/pixaluraratorajug.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/dezesanetanewugutowulemo.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/gidemoz.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/12055910712.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/tejarubivawan.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/rixefuporapidexogagonu.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/37187565575.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/ritulavunu.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/dovanojixapawi.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/64887161462.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/lifalofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+music+player+for+android+2020PDF 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_off0000d418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD418 15632 bytes
SHA-256: 3271aad7b2bc2d14de35ac8f953fd5aa9b01da2f0e03c5106c48be8714989054
font_01_sfnt_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 11288 bytes
SHA-256: 3a51c88c7f4d85fbc2b7285f47ad94137a8c8313cbfffad96a8c300f3e6d5f01
font_02_sfnt_off000116e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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