Malicious PDF — malware analysis report

Static analysis result for SHA-256 db446bd72737be57…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 13:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb8c86759c939c64d1b1d8ab61061469 SHA-1: b128e5ee0d4812059e0a3149ee19e070f39f3a1b SHA-256: db446bd72737be5718c73a0781b5f62eaa4cb483f0cf90360d12c2dd9afcae23
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1553.005 Security Software Installation

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, suggesting it acts as a lure or downloader. The heuristic 'SE_SECURITY_BYPASS' indicates the document instructs the user to disable security software, a common tactic for phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://inwebjor.ru/uplcv?utm_term=download+cheat+asphalt+8 PDF link annotation
    • http://princeverma.in/uploads/files/mefezexeteko.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/44647129148.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xudaj.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/85318796797.pdfIn PDF document text
    • http://ukrfirework.com/images/file/97719568883.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/favoguribu.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/kerixivoliwagof.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/33380714404.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/desilefutefefudujipapu.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/8267851189.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/86321206134.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd4c4d7fc9---83019096028.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/92435908706.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/92128412253.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/35849801278.pdfIn PDF document text
    • http://rococosofa.com/files/files/86487834839.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/37745802515.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/16960109710.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/43241100806.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3d7daf7dea3fc39abddff0b0cf5995ca/48140694164.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/35153026049.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/nulabunanevarudojijijuzez.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/7927364060.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/kopizumokemakerame.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_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 18880 bytes
SHA-256: a842e275c3a662c9f4ad6737d692e6bce4c3a942eaeb61ea6b80f5ba753784e5
font_02_sfnt_off00012d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D77 10716 bytes
SHA-256: 3556ef1f32b5a8d9e5a7327a4421a648cd1f07dddf0a4795c37add80ac95d4be