Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b89875910593c83…

MALICIOUS

PDF

71.6 KB Created: 2021-09-12 10:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d395dc985911accad5b6791b0ebeec8 SHA-1: b87201d75a8e79635d8a54726da3ec5c91fea728 SHA-256: 4b89875910593c83f97f95c59e394d05e5bde6f2d66fe786db7ee07be639843e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to various domains, suggesting an attempt to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a common tactic for distributing phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/wijejijeda.pdf In PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/92509825744.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/gagikotojibexufibozo.pdfIn PDF document text
    • http://zeci.nl/im/image/dosabativu.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/14748957662.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/67003432801.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/kekatadekajiwasudipuf.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/03c27befb79aef4b0ff5085c0940157e/47342753907.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/pevuvunosutumodog.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/nijevasu.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///2583839722.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/fovaniwimafakiran.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/xojewusulorulofofimeb.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/fevobilizotamuduxaxeji.pdfIn PDF document text
    • https://trexanh.net/upload/files/xazarug.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/57206182996.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/gafexome.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/53365021066.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/vuzipoxetarumelo.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/bagavi.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/tijudazafoxetenamezera.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109042052152737.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/94357473294.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/6841271668.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/dufubodafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=redmi+note+8+codmPDF link annotation
    • 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_off0000b9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D1 15772 bytes
SHA-256: be868b90cb93c4fbb2b37f53767c7b40fe82a74a05f835e8f59cdff7d7ae0b7a
font_01_sfnt_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 10308 bytes
SHA-256: a56675bc70d6b8bdad79142173f864951082e18f5710014a4ab2046946ea88cb

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