Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee234a1c5ee99d2…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 22:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b86fade021ae0ab7232fa895fc73bcad SHA-1: 5d5f993c49ab4439ff0513678f1aadf6a97bd334 SHA-256: 6ee234a1c5ee99d206571dc9c1650231fd82a0ed7324312308f60ceb0187eeab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic findings reveal it functions as a link farm, embedding numerous URLs that likely lead to phishing sites or malware downloads. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=how+to+move+apps+from+internal+storage+to+memory+card PDF link annotation
    • https://101doctor.com/uploads/ckfiles/files/61387b5a2eb5c.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/gasozoxokavodoxaketemoru.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8a770e63---dewenizonesinukosiwu.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/10045128377.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/67338911885.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/46911390425.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/65163096753.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210906_190547B0BC201583.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/kemizapakozijoligezabi.pdfIn PDF document text
    • https://bloc-immo.com/images/78216466272.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/jabuluku.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/vesorojolivemonepotele.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/5508768739.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/39605259900.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/18114628557.pdfIn PDF document text
    • https://jss-moms.si/upload/File/42997207802.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/11589826936.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/10404632779.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090310200373499.pdfIn PDF document text
    • http://videocycling.info/files/file/97751625051.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/wolusurunikarewomigujan.pdfIn PDF document text
    • https://renewone.de/files/85304576331.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/28152941311.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_off0000d440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 16756 bytes
SHA-256: aeeaad68a2ad0b8dac6408d4d8b62033976214b6aff66ffbc9b0862767eb9c6b
font_02_sfnt_off00011832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11832 11220 bytes
SHA-256: 266cf4bd1af3b660d3019cbe081d236d61a8c89869fbf98de1f198943a9699fa

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