Malicious PDF — malware analysis report

Static analysis result for SHA-256 8444f9865ed333c7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 20:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d70fe628ff81ab165a414420d217cce SHA-1: 64378908263fee8e72ee065136d8ed982f068fbe SHA-256: 8444f9865ed333c75b077879dde35e05ebe6b941cf2c5871c709ae38cd0651c2
134 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, including one pointing to 'drafthe.ru' with a 'coin master apk mod' query, suggesting a lure for potentially unwanted software or phishing. The PDF structure and the presence of external links are consistent with a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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 https://drafthe.ru/uplcv?utm_term=coin+master+apk+mod+2020 PDF link annotation
    • http://www.morrisjones.co.uk/EditorImages/file/detife.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133813b69ff8---jedibobekukiva.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/82843982913.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/wuwateputezakifupewa.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/14320750012.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/rudowi.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/96085777424.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/29069820695.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/berimotamebemepugonakuv.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/ziwitenopozavewidutawu.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/67596930600.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/zerudejebufodorinopane.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/jovorutitareripu.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/7564531091.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/lazusidofefupofitir.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/37041771994.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210907200433.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/pevuduzebukopeg.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/tinizete.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/pebapidimeseresepi.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/dekawija.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/bisutegamurapivotiraler.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109050822066117.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/zezulunafexirinoxukuxav.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/85097540756.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/2478431010.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_off0000d0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B0 10872 bytes
SHA-256: 0816538cb4fb373d3c672409a8db302dd9aea928a392292b2fb1402ebe04f185
font_01_sfnt_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 20892 bytes
SHA-256: 7ae6058fc0d1b2a685017bffbd28fbbc2b5a6710efb62072c90ff6f3ed100003
font_02_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1