Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ac769ed83c2d24…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 18:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5100d2cf9eea3dae9b9f48c381cb70d9 SHA-1: f9544b93632f61894d8d8e9f45c0184e66d12800 SHA-256: f8ac769ed83c2d244510f3422ef22c230dd56c60722cfd0d7b5fc123f183ae7a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs, with one pointing directly to an IP address (140.121.180.103) which is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and URI findings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://140.121.180.103/ckfinder/userfiles/files/titogigazi.pdf PDF link annotation
    • https://ambalatender.com/upload/files/zonulaxejewowufedowavo.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/faxamebuniwibetumavur.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/72886892732.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/42389188255.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/xanuruberegisoj.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614257e6ef87c---11576865734.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/71092336052.pdfIn PDF document text
    • http://kccmaul.com/files/files/66974404680.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/jajewimuk.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/42381543324.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/xepevubojemiwemuso.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/pefelefes.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/56800057039.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/rilonipisumotilepod.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/xozugunijavexos.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/fonaveluzirose.pdfIn PDF document text
    • http://labradory.pl/file/zaxetekugepunawodudoju.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/94484936009.pdfIn PDF document text
    • https://x-software.cz/data/file/18824727798.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/20252860432.pdfIn PDF document text
    • http://firegallery.ru/img/upload/78851952297.pdfIn PDF document text
    • http://tzsunup.com/upload/77737513734.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/42594987142.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/23001075279.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/kosawudadezimudufavagogif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=saga+bloodlines+pdfPDF 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_off0000cf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF61 10688 bytes
SHA-256: 37b45b64d8c853953f936148dff106ca65eba891598fcd96c69ae3c57cfb7d78
font_01_sfnt_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 19900 bytes
SHA-256: 2ec87a100c8975649e4a7cb2811ab69f53e8e76180a8522cc7c3c2aa61c3a533