Malicious PDF — malware analysis report

Static analysis result for SHA-256 43187731314a490e…

MALICIOUS

PDF

88.0 KB Created: 2021-09-16 20:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 41cde4d59690ea4014642f0e81f8c93c SHA-1: 8264d3a1c30657c15eea0ea96d79f8034fbf3432 SHA-256: 43187731314a490e90463f3a4392750530cafcabe2a0ca68b1f4f1d785eb6553
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple external URIs, including one that appears to be a redirector for a download lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm designed to host malicious content, further supporting the phishing and download lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://ketchas.ru/uplcv?utm_term=korean+pubg+download+apk PDF link annotation
    • http://nj-rshb.com/v15/Upload/file/2021941938301727.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/zikowujarafofirevamowi.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/14991010339.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/46761695891.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/noloter.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc1be1054---47823346194.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/99947033246.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/29078138632.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/pasipevuwonurakebogogekug.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/79870553089.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/jarokaxagiwo.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/17138115099.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/93518318091.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/76581144728.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/42667430971.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091215343418.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/15137730281.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/66439537722.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/65083961117.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202192444481403.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109070302246755.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/85377134777.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_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 19628 bytes
SHA-256: f1569ab936b12160f4cfc5486e8cc6534eb1d9032cc5184e6b5985c13b1cdc28
font_01_sfnt_off000122b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B0 10620 bytes
SHA-256: 2e1fd766eb27ce11535f4393ee7b02d4635a5b61cf2b57475193d52506ec77ca
font_02_sfnt_off00013a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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