Malicious PDF — malware analysis report

Static analysis result for SHA-256 d158a9e2404e263a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-15 21:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 10d5a60761478e2b57abd8004dd6c2ef SHA-1: 5babe4adee0b45432c0bc9599ff19af83d061846 SHA-256: d158a9e2404e263a17906abee22e8cb8fd39a8275a3a97a02e1348a608d18651
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, many of which are structured as link farms and point to disposable hosting, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous URLs and the overall structure point towards a phishing lure designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://hitourkorea.com/FileData/ckfinder/files/20210902_AFFBE74C2E41886D.pdf In PDF document text
    • https://sieuthigo.vn/upload/ck/files/rijozekige.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/wapilisipowizakebibo.pdfIn PDF document text
    • https://tckontrola.hr/files/66072985853.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/73158533105.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e10e74027bc235f93e810de771562c37/wasegakowadiral.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/sukavab.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdd4d1f428---37401140562.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/dedugufid.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/dozezilumebiko.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/fesazisefepikuniwonedimo.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/90724486035.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/timixibufeparez.pdfIn PDF document text
    • https://medpressa.ru/files/file/lewazabotiwavurifigubu.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/50259921305.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/68540621428.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/kenexolamo.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/badopafakadutevopijaru.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/fafuwagegatenadiluxa.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109051757582792.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/jexikizemujodeg.pdfIn PDF document text
    • http://8njl.com/userfiles/files/62045104988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+forza+horizon+3+android+no+verificationPDF 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_off0000c9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DF 10788 bytes
SHA-256: cfa023226bd6b3246e07550a9fbe2ac0c82e5914716707c2e9e8a427c7a5472d
font_01_sfnt_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 16992 bytes
SHA-256: 8e4585cce5041d7024d1d4a2efba9d58c94a170c1838c587ec00e6fa81645b04
font_02_sfnt_off00010ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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