Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1bb3f64afd3374…

MALICIOUS

PDF

88.4 KB Created: 2021-09-21 23:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84d713e6e48b66cb372dd21146bc3cad SHA-1: b37c63cc4523c7f707798200f2809939d10499b1 SHA-256: ad1bb3f64afd33745dbab79d558e1182adea200e45016e31af575f1d0928d9b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://archism.ru/uplcv?utm_term=chess+app+for+both+android+and+iphone PDF link annotation
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/jiganagilajigul.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56962614209.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/lorasuzewirafilatutida.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/gumadaxigonuzenakakurugu.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/59103806534.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/wenoruratugi.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210914_024558.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/rasizalen.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/58478683044.pdfIn PDF document text
    • http://aminotp.com/upload/files/xijabozuris.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/95852163632.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/69246056768.pdfIn PDF document text
    • http://adice-area.com/pictures/files/41019033744.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142bbebc433e---32324630742.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/vezig.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/77001187861.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/65207479223.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109100733189910.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/buden.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/fubagevunatipunuler.pdfIn PDF document text
    • http://vladekoservis.ru/files/53710914803.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/37936957900.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/62085301003.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/35605518389.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/4248842019.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/bixoneduf.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/sewumikewebumituxomob.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/25241476125.pdfIn PDF document text
    • 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_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 19252 bytes
SHA-256: be30213265cb5960be738832420505d780873cb9298d55827464a754d10a4811
font_01_sfnt_off00012341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12341 10720 bytes
SHA-256: 103c5f788982b6e75cf2c19c34c49aef04534942a15a64487b90af989472ddb8
font_02_sfnt_off00013b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1