Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ab28ac08e49a66…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 07:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 657b742a02a946e3493f272c3a2688a9 SHA-1: a9f6969417e20e7b30c20009b0118339b97d72cd SHA-256: a7ab28ac08e49a664c76c128491e5b02cbc563d625b0e78d49b93752df6234e1
146 Risk Score

Malware Insights

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

The PDF document contains numerous links to external PDFs hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or phishing content. The presence of an IP address in a URI further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • 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://plagij.at/ckfinder/userfiles/files/82258357787.pdf In PDF document text
    • https://unifor975.ca/userfiles/file/saferatujutukudo.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/56382769496.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/7901798343.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/majadel.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2863db248c093ccaafa1579fd83755be/16674636473.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/tewoxutolegisejaz.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/8527006393.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/nituwivivikif.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/3795708896.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/51105462065.pdfIn PDF document text
    • http://charivne.info/images/file/56396474816.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/xamalejaluxitujitafurin.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/1395139820.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/ronomaxakirel.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/84634447322.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/xomitufej.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/bidovuta.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/62009473330.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f14c47c383---36829685310.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/latufofegabomubabena.pdfPDF link annotation
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/gasinugiwiluluxesozawotog.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/nemedobojivegugejimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ah+d+hack+downloadPDF 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_off0000d556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD556 10036 bytes
SHA-256: 9f20a0679ce771bd58fd7ef3a95d74bdaac3cc02ff48f7a8dd60297bfa5f2a57
font_01_sfnt_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 18480 bytes
SHA-256: bad4c3d4d5af32ef6c45fb8c6aa391965a4c5eae4443fb803228407c15799dcf