Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37bf54e4403c3e8…

MALICIOUS

PDF

93.0 KB Created: 2021-09-13 20:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5946c84276bd37f532b7290bc2b5a179 SHA-1: 0bbcd92cbde179fb3a4274ee779dab065efdcdc6 SHA-256: a37bf54e4403c3e8b5ed722d3949271c61719791bf6c2a7d3f2638bcaba2c981
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The presence of numerous external URIs, many pointing to disposable domains or subdomains, suggests a phishing or redirection scheme. The embedded JavaScript likely facilitates the execution of malicious actions or the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://qkon.ca/images/file/woruviz.pdf In PDF document text
    • http://kppzp.pl/userfiles/file/75770337245.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e873d19d---3597227185.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/mutoguwaxa.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/lafutazojuxijiwekodura.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68b992dbc---668062241.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/pesumekikir.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61320e607cdc6.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/kifipukuromafivilisexu.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/wiwovunonefunuvoriwolapuw.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/genulozixujatip.pdfIn PDF document text
    • https://dcimx.com/files/rudujiwekowa.pdfIn PDF document text
    • https://pellevah.com/upload/files/noretuj.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/61738163622.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/goxopoju.pdfIn PDF document text
    • https://esz.jp/img/editor/files/58405135298.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210905075440.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/13085344546.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/talijasovoretebokufa.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/sewovu.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/xitunizirixo.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/xawuje.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/86832671423.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/77111252216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=final+fantasy+tactics+like+games+on+steamPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/xovugarisidob.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_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 10760 bytes
SHA-256: b4a8852aea17a0d913958ae5b1b69ab3e1bea2156f0a63534ddfb1c45be6d1e1
font_01_sfnt_off00011f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 18280 bytes
SHA-256: 04a15a0a88d5ef712660de99867e8ebe14fc8c08139ab887ca37d5c80ebea949
font_02_sfnt_off00014dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1