Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc563046fd9e5de5…

MALICIOUS

PDF

84.9 KB Created: 2021-09-09 01:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 71c4b2ff2a83e84a7bc094853d068e78 SHA-1: 6a5dbe72dd60db3fc8ab1617617713991a2ad99c SHA-256: fc563046fd9e5de579621fe538a953e9d250e49dc014bcd15ed79d8e4eefc17a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous external URLs on disposable domains, likely to distribute further malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=can+i+download+safari+on+android PDF link annotation
    • https://interativacorretora.com/fotosempresa/files/36153607250.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/71441118970.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/98351683027.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/sebidasakokikigukez.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210909054453_lkfrkn.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/pikepaxexugatijalikuvod.pdfIn PDF document text
    • http://faradbox.pl/files/file/30602963840.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138eeef1598f---84401557040.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/fowuvak.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/gebufuworomi.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///72963825593.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/21595799399.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/nometezigojoluf.pdfIn PDF document text
    • http://medi-sen.com/files/files/wesubixebodilatufogiji.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/12567970278.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/retomufa.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/32545618627.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/322811529.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/42542792128.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/zepelubipupuwegixibig.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/betigokefamiga.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/28737628304.pdfIn PDF document text
    • http://chemsdano.com/upload/files/dorojafagiledag.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/mabumituxanupugaripug.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/wiwidomamepafitu.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/fidemirunodivipeka.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/kimawifenojelisu.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_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 10232 bytes
SHA-256: e51c8270506071a305189c68cb3f3ea81b0fb37503dab11f6f32f1c87034e497
font_01_sfnt_off0000fe68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001167a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167A 18012 bytes
SHA-256: a68c10f7bf21e6c232949daf7f6be9f5eab91a98791bed71406fcdeafadf310e