Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00fd8045a6c7b64…

MALICIOUS

PDF

74.4 KB Created: 2021-09-30 22:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: df3328a8df52bc4b4b1078c6fee8c51f SHA-1: 49430365e090c1544cbacaa47f8f784a13da882d SHA-256: c00fd8045a6c7b64707b75ef2ead8e6afa952fa1607796ed14fa2dfd81195876
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://smidgel.ru/uplcv?utm_term=apk+mod+dream+league PDF link annotation
    • http://crosswaysrecruitment.com/userfiles/file/romenudujofonolatujifap.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/72923365144.pdfIn PDF document text
    • http://chinazzjx.com/d/files/jusukefevowab.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/periluvem.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e62155658b---4389682855.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/kozevisira.pdfIn PDF document text
    • https://estoniapools.com/contents/files/zewikododitafomozir.pdfIn PDF document text
    • http://aurora-c.jp/files/files/dumeramubunisitepuvojut.pdfIn PDF document text
    • https://j26clean.com/upload/files/xolelavazorugola.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/gibadorimak.pdfIn PDF document text
    • https://dyaa.club/uploads/file/dubejofikibuxazo.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/vekamizefixazitixaxeguf.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/xavogi.pdfIn PDF document text
    • http://ruresept.ru/files/file/41874887116.pdfIn PDF document text
    • http://nfc.soo.jp/file/3325177579.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/1068719613.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/xegovexolijedabiwitavufi.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/36757519922.pdfIn PDF document text
    • http://mamitobe.ru/files/file/matejitotetel.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/lunije.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/xepofa.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/23843999319.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/xoxobosexeposokomuzimodas.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/80449408153.pdfIn PDF document text
    • 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_off0000b978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 19740 bytes
SHA-256: 7e37b0d57b4d1a35865c50900f57e100fd1e93f819e372552db2dd91337566f7
font_02_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 10448 bytes
SHA-256: b1375e7e7063ee50ba65ca924f37293fbe7e5914296d0ea30197aeb4ecd95553