Malicious PDF — malware analysis report

Static analysis result for SHA-256 465eb766214b01d0…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 18:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 68c477def65139f20b63aeb567d2f953 SHA-1: a1c61d6d9e1b49e563a1d54b49bba4c4805048df SHA-256: 465eb766214b01d062f3ed755a41fa0450e46180ade35bdfcfe974f366429dcd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, presenting numerous URLs, likely to deceive users into downloading further malicious content. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing attempt designed to facilitate the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mywymc.com/userfiles/file/wanomerog.pdf In PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912210937135497.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/makavizivovopofumibexu.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/3941876639.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/wulofumedavobe.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cec1503cb59ed5083ab3aa2a87f12064/38379273073.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/19619951613ddba7392f0.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/85535099892.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/rirotixoraperotux.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/35382338134.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/bobepomapup.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/89718929565.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-6/20210906054738333919.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/buramikakov.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/938155678a4b0b0eaf7f5671d9e0d727/82074642205.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210902152452.pdfIn PDF document text
    • https://ratosatu.com/contents/files/talerobugerizifov.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/6549738779.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/24866482590.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/8576253234.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/senukonewu.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/runiforitakikajujoz.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/77835175696.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/goforidalofujuvagezawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=wwe+2k14+download+for+androidPDF 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_off0000ddac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 18220 bytes
SHA-256: 8a83cd570e53ab04b58d22fb815edf0757ecac82602d0998a014b35bf258a62f
font_01_sfnt_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12547 10500 bytes
SHA-256: a529ff4f31eeaeaab2cefc45d7a167b1885a411ec3c1db52e2beff57a91e5c40