Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a249adcc8b14db…

MALICIOUS

PDF

92.9 KB Created: 2021-09-10 20:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 593dea1dc75c7e080c7800ccbee1ec1d SHA-1: c48d05dc5533b6e416152cce4bf351449b803354 SHA-256: 13a249adcc8b14db8862d9b4158467f750fd1d340f0532d1427b4db77fae0e7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains a large number of links pointing to potentially disposable domains, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://abriganature.centralcms.cloud/galeria/files/natejezidironarovoduze.pdf In PDF document text
    • https://ln80.cn/filespath/files/20210905085753.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/99477668850.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/64638156562.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/gapubemixovof.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/tujivumejopejovam.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/bexud.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/nifaru.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/nafanapebikagigip.pdfIn PDF document text
    • http://standdominica.org/files/files/11392563924.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-6/20210906053507838775.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/dupejeputuwudibofewaka.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/nerifibefuvagoxifisogo.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/7505595b76879dbeeca5477eb84f0654/bujujesagosijivawokevipek.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/40601903971.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613612d4e1328---bitasawufefofazuz.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/97189494136.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/womuwosikijokirelidi.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/kiteboxulojupaba.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/72835162645.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/dedilujorewipiriwosako.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/vamipi.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/51947350351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+half+of+it+full+movie+123moviesPDF 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_off00010944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 17376 bytes
SHA-256: 1fdcb410c1a5f074f583a79caa164fc1b520d905b763d345ab97f289cabae0ce
font_01_sfnt_off00013631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13631 10748 bytes
SHA-256: b6669a7a7ee44822f1694ea8a9147a176e998ae5b236338dc0121d919e7481db
font_02_sfnt_off00014f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1