Malicious PDF — malware analysis report

Static analysis result for SHA-256 842db440119ffd50…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 07:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: adb424f2f977568c2e7727d3883db474 SHA-1: b63245a20225f5594a796905e98dec446fbf1cf0 SHA-256: 842db440119ffd50e13b81d1d57bf1d57d36cd7460417f3ca2eb0c643f33e595
94 Risk Score

Malware Insights

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

The critical ClamAV heuristic identifies this PDF as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to external domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3253

Heuristics 4

  • 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
  • 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://victoryelectricalsupply.com/ckfinder/userfiles/files/motodejerodadaj.pdf In PDF document text
    • http://fbrasil.com/userfiles/file///36570876526.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/vexoxemej.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/71309894535.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161370572bf0c5---86792830720.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/vafafiniludorutagejifivax.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/sevojetoj.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/18273114266139c053c79ef.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/zuvaxatidibevulovilokera.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210912192959.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/xapevik.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/11503045139.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/45701541675.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/pifofilive.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/ripuxokedulolalutimov.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613923791a758---bogobo.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210905114904.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/15071644419.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/xejukokeferu.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/kiwujofogujozo.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/10760917042.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/81685088636.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/82437921943.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/dafotet.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/41849557147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=parcelable+vs+serializable+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 10532 bytes
SHA-256: 1dd0ea7e94c6808beceb17c1040f4a9d61fa9ef0b9fc1f7196439eabf0c9c37b
font_01_sfnt_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 17844 bytes
SHA-256: c24c512905b80b386495d5bf4650893d1e0ab1a7ff7c3bae73d18547a7ebaf1c

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