Malicious PDF — malware analysis report

Static analysis result for SHA-256 671d7b549d4be3d5…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 12:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c450264040c85b074293c52c5067e38f SHA-1: 85022fd0a2ae856129f87157ee8834d29171684d SHA-256: 671d7b549d4be3d5332929702813f7ce659b825b2376bff95f8cd1af2f95c018
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a phishing lure. It contains numerous external links, many pointing to PDF files on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The PDF's structure and the presence of embedded URLs, despite the document body being unreadable, indicate an attempt to redirect users to malicious content, likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4977

Heuristics 5

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://avenue102.com/uploads/file/17512599732.pdf In PDF document text
    • http://asiavent.com/UserFiles/file///dokusugofevatusadewipimot.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631221863.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/6641863378.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/minizad.pdfIn PDF document text
    • http://sinostandards.net/upload/files/67990253378.pdfIn PDF document text
    • http://ore-processing.ru/d/files/71654119578.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/neratugomegasewizeve.pdfIn PDF document text
    • http://konberdbio.com/upload/files/fonorotakajuxoka.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613653e72a470---2963162416.pdfIn PDF document text
    • http://iviltra.lt/images/files/gisanov.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/tidogu.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/14840441376.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/47431742812.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/94207962517.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/dujuxekusofenotatefetomi.pdfIn PDF document text
    • http://pinxedien.net/upload/files/42623069456.pdfIn PDF document text
    • http://myslizdrave.com/soubory/wanepixabagimiturateweso.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/dovmf60jeqiamsrk3h6bjkr7g3/58005640746.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/53222950722.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/22749202434.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/parizusufetajifajajug.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/85973480529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+recover+password+macPDF link annotation
    • 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_off0000cadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADD 10576 bytes
SHA-256: d939e138097ebb9ff00c8d7cfcb3fe5f3a4304ede17490e084755d14375054df
font_01_sfnt_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 18084 bytes
SHA-256: f75de078a97c67093ede1422f95f47449e6ded83394ba1cfa80cc3af4ca3ecc2
font_02_sfnt_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1