Malicious PDF — malware analysis report

Static analysis result for SHA-256 8135d65851ff880a…

MALICIOUS

PDF

91.2 KB Created: 2021-09-13 23:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a33774aa96a05fac68c54fb66d29c260 SHA-1: a11767f14e8ff4840c53a027d2eee44f7698846f SHA-256: 8135d65851ff880ae739238cf7f3256bba43aa162c745afeb536901039a8ad32
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple PDF_URI heuristics and a SE_CALLBACK_LURE suggests the document is designed to trick users into visiting external links, potentially for phishing or to download further malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://poslovniimenik.net/firme_data/files/nozorenef.pdf In PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/32938181401.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379d1713f51---mulopixazinevagog.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/81582475941.pdfIn PDF document text
    • http://hydrem.ru/images/file/80939843321.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/selojefub.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/pafimo.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/nipabuwiraguluvogo.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/nujiwi.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/39195646270.pdfPDF link annotation
    • http://tabouligrill.com/ckfinder/userfiles/files/gidonitagamepisivu.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/loseluwafagimuduvipanom.pdfIn PDF document text
    • http://bociany.sk/media/file/sifaminewokikotef.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/jatudipadixudilotogasof.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/87912402290.pdfIn PDF document text
    • http://ausafe.net/images/art/files/towodad.pdfIn PDF document text
    • http://primaneighbors.com/userimages/51551891803.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/25684725882.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/22649846616.pdfIn PDF document text
    • http://czminghe.com/upload/files/39242696588.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210913194706.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/mosenafokufakagax.pdfIn PDF document text
    • http://qdjshg.com/files/file/74337604738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bollywood+online+moviePDF 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_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B98 10200 bytes
SHA-256: 6b293c9b191eaaaf238df170ad9936198b2a530fa3653f255c5510fe8f4ce893
font_02_sfnt_off0001326d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326D 17228 bytes
SHA-256: ca889e38959a991b743ee9ebc7ab147712b1cbaf67974fd3f977ec7e369d5e55