Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e0eba1a7b74adc…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 18:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e2159cbda82582d0ef6d3d7a962b2640 SHA-1: 27bc2a65fbe7b7a9c489bfd3fb50912abf56021b SHA-256: 84e0eba1a7b74adcfa9de955002b434e8e470cebcfc881771f5ab7c2fd823bea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Embedded JavaScript and numerous external URLs suggest the PDF is designed to redirect users to potentially harmful sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zkojicin.cz/userfiles/file/74556919562.pdf In PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/dexedapebopexuk.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/vowakamufegeditan.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/sidumujememojinuda.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/42690395500.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/xejopuzesane.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/mamagamamurib.pdfIn PDF document text
    • https://keongracun.org/contents/files/298001026.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/gujurutakovativoses.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/kukexitosegomivi.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/2472852962.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/vibogaxatelapekowatepumek.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/57601385420.pdfIn PDF document text
    • https://afayl.com/userfiles/file/24519008666.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135d0a91e2c3---vuvasokewinogogizoje.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/nivufuwisezuzurijizerozop.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/voropowakutanevogiwapi.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/tipasegatemat.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/zixujimujoj.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/xomig.pdfIn PDF document text
    • http://tridiart.cl/ckfinder/userfiles/files/newazila.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/zetikakuxona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cadillac+%26+dinosaurs+apkPDF 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_off0000b02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC843 9664 bytes
SHA-256: 1ade041fe188c9e34262206a2847e2b30e5f7bfc0f8888b5ecc83aa035cb076d
font_02_sfnt_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 15280 bytes
SHA-256: 9cf4d8f2fa8b4cfd348fa3a6710f0ef30220953c73398eb1bb250acc2ae01902