Malicious PDF — malware analysis report

Static analysis result for SHA-256 6000231bbd1733c1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-24 10:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9cf37ac4fe7d5668e9d62ef8a3292b1e SHA-1: ce07096bc14ca7d58c5d9094caa37635f19ce3b8 SHA-256: 6000231bbd1733c1efc20fdcb197fb1160f944e8948d57c566c5cf09f263f894
174 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate the presence of an algorithmically generated URL and a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=pc+games+for+android+free PDF link annotation
    • https://sahodayabbsr.com/test/fckeditor/file/sifiwa.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/49772152717.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/niragunuxolafeloku.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140159728135---danupiwun.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/98028661777.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/2087933320.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/fofef.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/finudixolivekumib.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/xevigu.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/82964783578.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/wuberejif.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/virozafizumozuf.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/tamosabifewuvuta.pdfIn PDF document text
    • https://lorus.rs/files/99052582116.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/kugasebavesufuduva.pdfIn PDF document text
    • https://turystycznapodkowa.pl/userfiles/file/91819616051.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/gimufo.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/69754236527.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/10120855501.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/dijiwufuxumisazeneb.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/mawonofosewewelu.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/81677857497.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210917162422.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/11533417608.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/tamifefutogisarune.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_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 17876 bytes
SHA-256: 4def2971813458893b4dfa74c404e36ca8b500f39c65992b245c9e4a329a7a07
font_01_sfnt_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 10676 bytes
SHA-256: 8c1570295eb7a405da52458246becdbbc716889a28c96f3af979e54ae284f351