Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48cfabe9accaf53…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 14:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4825ab757cc735a0b385209d5c68f594 SHA-1: b51712083ab71ceff53e544a0ec6beeb5d9d5ab7 SHA-256: c48cfabe9accaf53a03b4a584386bb710eeef012c606bdcb14ef9b7cbc5d2153
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, with one pointing to a raw IP address. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of JavaScript suggests an attempt to execute code or redirect the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bassbasement.org/userfiles/file/batawubelogivi.pdf In PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/19902791544.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/39006559323.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/baxulowofeputakasigujigej.pdfIn PDF document text
    • http://schubert-hh.de/image/file/70855873151.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210907150606105320498.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210901175102.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/ravawugimagulaji.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/likifutirolozagefu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb9efb1aa3---35548975618.pdfPDF link annotation
    • https://stratasphere.online/userfiles/file/faxoda.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/89235235867.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/93769327926.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/wupagegorezusako.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/26598349386.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/18075713979.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/94693105390.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/86967924125.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b7c5aa27---4423882255.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/tuwukurotederotagax.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/baloxomakomixitokemosaru.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/bed3c244a71624875500d33b2df80fe2/20525842985.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/42149614366.pdfIn PDF document text
    • http://insei.eu/userfiles/files/zavogamulerib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+apk+for+ufcPDF 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_off0000d43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 10476 bytes
SHA-256: 35fcbb050b839f3ee70389ea3071fc47d498f1fdbc792dc469ef072b4fd87201
font_02_sfnt_off00010463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 18096 bytes
SHA-256: 2decabb28ebbb27dc0e9533853945edce7cb9fb217e4837849f02dba50adf35d