Malicious PDF — malware analysis report

Static analysis result for SHA-256 44720d296a0f762f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 03:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bff36433ef078bf4be4d51fb9bbef0b7 SHA-1: fcafd0f4f17c733b57d12b1184e11c09275acb05 SHA-256: 44720d296a0f762fe5b4839b9e77554377ebde1da0139281243478eeeab48340
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains and are used in a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or trick the user into downloading further malicious content. The embedded JavaScript is likely responsible for initiating the download or redirecting the user to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=download+nexomon+full+version PDF link annotation
    • http://studiorestagno.eu/userfiles/files/jeredulu.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/86025791925.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/41611122535.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/fupiwuzozerusere.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/98737985341.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/xabat.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c06d649b---kepigufovefuwunogezo.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/gedulekij.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613735ad4b966---tabaxig.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/zojetowezenovazisu.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/74582998899.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/kafimifululebarunuxerag.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/44205533889.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/44366979422.pdfIn PDF document text
    • https://ip-pharma.net/data/files/42721549886.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/10549281946.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/82546157388.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/39480299927.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/4423655615.pdfIn PDF document text
    • http://moretonassets.net/userfiles/3086360299.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/pagurawuxenojuvosovib.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_off0000d5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FE 17436 bytes
SHA-256: d1710534b0bd89a99e4768e9d4512d0fa266d200ef0652a477f7fca9e1bd1850
font_01_sfnt_off000103ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 10772 bytes
SHA-256: 53ac473dc11e00bdea52b1ed67fcf3d43ba7cc876a9a09c3950f40d8382171db
font_02_sfnt_off00011cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.