Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d7ffffa0b9e000…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 04:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c3d5aa8e9ed8b8d09072f37c002c69e SHA-1: e354511f798a9c35a69ed0c81a834454702b2593 SHA-256: 91d7ffffa0b9e000fdbb423348f9c88065c357d335fd5fa8f9a8c7a78f627681
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs, including one pointing to an IP address and others hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic 'SE_CALLBACK_LURE' indicates the document may be designed to trick users into calling a fraudulent support number. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing payload or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://synerhu.ru/uplcv?utm_term=download+ppsspp+gta+5+iso PDF link annotation
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/64403897948.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/85074820319.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/foviribenasimavejesin.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161523b58b8ec0---suzolek.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210921_22C28E44B2CC4D7F.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16320605992785.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/44480887222.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/paximen.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1614d136231a16---46064905745.pdfPDF link annotation
    • http://notariocprietoa.com/notaria/documentos/files/wudesidotagematojixef.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/36885463067.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/97409531702.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/11054774463.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/18129727365.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/dojonizeda.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/50831223268.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/70007560421.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/17260638948.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/56698983193.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/fejegobuxivefilewuna.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/79815113983.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f7dd4d14859e67290795c706c6a1b40f/75336207146.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/siwomabijod.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_off0000b411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB411 17152 bytes
SHA-256: 92839d6d198623a9b73563163f2206c7c0a4e521831d4aea50867d2c8cf5b0e6
font_01_sfnt_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 10556 bytes
SHA-256: 4e07cdbf5e0f213a8298499583bf05175fe6679284dc5d93347a51fe4ef39101

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