Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb7631d32c651b3…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 05:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a77cfbad8f9022c49114e31d6dd4f4c0 SHA-1: 09604385402875d264a987ee67b96ad9fc6d76ba SHA-256: 1bb7631d32c651b34b301ca674f61be0edfe9f4ffeabdc5338315b9a11462aba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are suspicious and likely part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious technique to obscure the true destination. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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
  • 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://karlholmbygg.se/UserFiles/files/filuwufopoke.pdf In PDF document text
    • http://jurabos.nl/include/editor/file/87801013328.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/kivifegotanelumunaponij.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/56500342621.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/joxasuwedazolos.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142160315c25---gilepizadanibil.pdfIn PDF document text
    • http://keyday.ru/files/files/wasusuloze.pdfIn PDF document text
    • http://storemisr.com/uploads/files/pusafidafimefak.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/38191224887.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/40768911811.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/60006685571.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/16010008956.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/loxazejegupoxasogut.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/85791150654.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109040054355552.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/996102927.pdfIn PDF document text
    • http://rsst77.ru/upload/files/95848197384.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/wevosivibi.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419cac2046f---77068220360.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/12527008304.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/67336882445.pdfIn PDF document text
    • http://bscartridge.com/pic/71175555073.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/8412175092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=low+cost+leadership+companiesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD593 17648 bytes
SHA-256: 80f8e05ace01a79ea8adf91aa11164c7a0b769ae2b855bce2c4418fc12cbbbb2
font_01_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 16848 bytes
SHA-256: eabc93309ef03361bf0c33e41a487357d460bff50fc6af90637675188fbd1575
font_02_sfnt_off00011bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBE 10824 bytes
SHA-256: 979124b6b708bb866098cb479d453b02a491e8cf12ca265e7937f30b87f5b401
font_03_sfnt_off00013492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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