Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd678cb9f9088642…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 21:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2bed97283fb67f7a5d175b5d2da94e38 SHA-1: c6a02c62b5b9cb3f6feede18049170930d8fb560 SHA-256: dd678cb9f908864281bc185d3868f5b5c30643eff45fb479ade60ee35f96d92c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the ML classifier strongly suggests malicious intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://butagallery.com/userfiles/files/72294350309.pdf In PDF document text
    • https://bostoncake888.com/UserFiles/files/pisovaperozux.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/85340248553.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/tineziji.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/71066337610.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/gexegamipizuwilinibumito.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/51087089591.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/52144698393.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/solovezaj.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/07/file/33690432579.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/84269901761.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/99167072865.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/tufinajilesiruwojigu.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/26894497402.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/15497969935.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/zinoziduvoxazizinux.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/xowufadugemupogefova.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/54636340288.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/ripabumonamusupumevil.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/fukolesugegotetokixo.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/37718207513.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/543343195.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/wudavofijonedan.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/44147125334.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/30891059497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+sims+supernatural+androidPDF 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_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 18140 bytes
SHA-256: 6d06ac680870df791c622b76958af436a1e7a595b9a0e483109b3413ee8d9e61
font_01_sfnt_off00010d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 10720 bytes
SHA-256: 115fe78f75543f93881b0306030ef85fcfd594b113dd89cc47e27964c2ec4734
font_02_sfnt_off00012596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1