Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c36d3855b41851…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 01:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b5235471aba2ea8f257ce74003615d5b SHA-1: 5e713d39dedfb53ffe95a06abca81839ebb0b348 SHA-256: 69c36d3855b418513184eb68d617a9a1abac66127c7df60bef2c3bbf8aa24014
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The PDF contains a large number of embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://atlonnuri.org/UpLoadImage/editer/files/80325658763.pdf In PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210921_C1A6B33864A72ABF.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/sukin.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/vigirib.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/befododepororoninelelilu.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/76652434959.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/54826553768.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/96992886087.pdfIn PDF document text
    • http://didopack.com/files/nuzujo.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/datazexagojuzevasa.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/26215231816.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/32631333468.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/sozaguxuravegabazefumu.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/nawapowekubotir.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/65852631685.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/kexuridesewinoxegitoge.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4985a9631be012c389b2e072787cdfab/koxeka.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/99545904847.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091617232_367384461.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/jamokef.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/87129733386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=find+nth+term+of+seriesPDF 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_off0000d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 10388 bytes
SHA-256: e57222018460fcb23a581d2b0029738b1d130d34689b67239c1d535dd762e98d
font_01_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001042a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 19056 bytes
SHA-256: 0c653cb3f9eee0c4cc509abaac92c99a71e8cca8cdcd7f3e91d5d01e527bad0e

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