Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a045e45be7dfb5b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-23 10:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a88aac94eb2e23f72b4290c95a1edfda SHA-1: 97c57a565ae5592c42abea472421ffc5b4a4f28e SHA-256: 9a045e45be7dfb5bcd3a21cd2bcff58ed40b444b814ec0a25d17b7b22203b5ca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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 https://huntic.ru/uplcv?utm_term=wear+os+offline+music PDF link annotation
    • https://medosojewellery.com/userfiles/files/68115280710.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/26849660343.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///tibilawim.pdfIn PDF document text
    • http://vaynhe.com/upload/files/direjivekazomu.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/64315474856.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/zeguxidobodutap.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161339aff4a7db---2366548525.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/85964368899.pdfIn PDF document text
    • http://0048.pl/48files/file/zalaloguk.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/wonufofejudoguwa.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/tusudizulitisewunon.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210905_194842.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/67896087374.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3f18d0398f28824677fed285d8fd4122/44962323371.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/kofigo.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/4507513586.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/73247365371.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/kezuw.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/namatote.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/kulolagenawuwir.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/zusozuxusumoval.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/1273815808.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_off0000cff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF8 10492 bytes
SHA-256: e4f6cd39760016d9130fe3c18678a31636ecd81661b64d459047eac8d723a914
font_01_sfnt_off0000e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 17576 bytes
SHA-256: d2f4f71e45f58a7360d29e7c2cfca14aeb7003b8c414f11de8d72542e46817d8
font_02_sfnt_off00011530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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