Malicious PDF — malware analysis report

Static analysis result for SHA-256 2738097a6c491c1c…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 15:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17c9ce8a4968cd1f495925429c5575da SHA-1: 2e3a5fa5e07930ebcccc926accd6ff18f29b800c SHA-256: 2738097a6c491c1ccc0aa281f15c7abf8c92fb21300fe847ad99aa153e8b40ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate phishing or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • 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://lynxauto.ru/userfiles/file/gabalip.pdf In PDF document text
    • https://hinodecoder.com/userfiles/file/89478046830.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/15705528866.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/komotufijaroxavuporigigi.pdfIn PDF document text
    • https://birudongker.com/contents/files/81493293232.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/jiwafezi.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/xefudidejotisotowalu.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/22632226610.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/didevaxisukimavepupolobop.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210905215909.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa3344edc3---kozonudepetesumuwiki.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/bimop.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/situgaji.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/75492860787.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/tusalepoworo.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/16597454681.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/bazujasovokudijobunugovit.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/36954151681.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/dedurudogonadaxowipig.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/88312579254.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/vuzefexorafezijudo.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/vumawitukoxuji.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/26408712308.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/25125163160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=barron%27s+sat+writing+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_off0000be33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE33 16068 bytes
SHA-256: 05ed688ed39f4a98894f3f06c8b6e1701350a609e4e195e07e3ba23eaeccd76e
font_01_sfnt_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 10668 bytes
SHA-256: eb0fb4f80f57bdc6d812f32c94f557316799aa976fc50afa318e307fda1fb18a
font_02_sfnt_off0001002b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1