Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dbe3586df1a0f9…

MALICIOUS

PDF

87.9 KB Created: 2021-09-12 15:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e92a09c79ea7d77819d62a71e08f3a70 SHA-1: 4e4a35ca2452000300bc137a4f9083ed426dcf46 SHA-256: a6dbe3586df1a0f9353e9126a133bee6412302b94863fed87e45f9794409721a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URIs, many of which point to disposable domains and form a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://codienlanhminhquang.com/upload/files/tedokinoxomosotabixokiru.pdf In PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134495598088---37331572832.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/mogino.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/kiwilokuxi.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/korowukikexuwiwururod.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109120624536966.pdfIn PDF document text
    • http://chinalabware.ru/d/files/25633977185.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/lotosijepoteta.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/kifivepuvipovafiwosogeki.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/girevaxewezagupaxuja.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba9953de68---diwusopaza.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/tizupisujukenevelir.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/78478376044.pdfIn PDF document text
    • https://securitydm.net/slicice/file/35066648868.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/ponuperiwexaxiniwilazu.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/20963048009.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/87309302308.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/47193773138.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/jekuxul.pdfIn PDF document text
    • https://csodamalom.hu/files/files/vixiwezeserib.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/fofagukiguka.pdfIn PDF document text
    • http://geraldinekilkelly.ie/pedonukonariw.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/xizobiwewa.pdfIn PDF document text
    • http://klhl.com/userfiles/file/wefopoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bronfenbrenner+theory+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_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 18764 bytes
SHA-256: ac1062e0c9bc2a7e80f1c54000c0d718707ce703e1b3dd5ef2d1a760187ed2c1
font_02_sfnt_off00013ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB6 10436 bytes
SHA-256: 37c554e06ea4119569dedf4d039efd0d31bf09d4dff671337761dd44ca84daeb