Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47cc64c9a71d7f4…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 23:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b6989aa9c1554035f3aab3d6cdfdd2f SHA-1: 958857f990e2923335b0216111df59b9a1b66484 SHA-256: f47cc64c9a71d7f4068da969f20a8781218db80aea4a6d4b135270ea854e0b0e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to PDF files on potentially disposable domains, indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF. The embedded JavaScript likely serves to execute malicious actions or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://firsttimehomebuyerstudy.com/images/file/pujugupofewiropatuj.pdf In PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/nugedevoxikomutobojijisaj.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b50138d9bbaecd7e9e384e66bea02326/jizupulusimir.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/sodatututare.pdfIn PDF document text
    • http://secretinvitation.net/images/files/ratev.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/77121314269.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/72052214386.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/79733537954.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/130807281438.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/68641272674.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/71881568205.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/51191441297.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210914_1470F183BAF5F598.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/7013223058.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219675701608.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/vikamu.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/gitaximomu.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/50111023965.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/1434098863.pdfIn PDF document text
    • http://turatabor.hu/media/18440968236.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/dfc52aaaa0b3d45e15998151e831efee/36411155062.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210916115212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=battle+cats+mod+android+1PDF 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_off0000b827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB827 20340 bytes
SHA-256: 7940be914d0e538a882d81936a73abee3bb9df88a233228c4946dafcb419a650
font_01_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 10636 bytes
SHA-256: 313d690ef44a7b664a58228406380786461f4a0103da9595c0e54de56d99c2f4

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