Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc9eec3a72c389a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-09 13:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 789c9dd5508428d5a05c2b08d0f394f7 SHA-1: e5819ec079f50975f924456acd202135613205ff SHA-256: 9fc9eec3a72c389a530e78a54cafeecb62a7914e69002597d2ffe24193aa07fb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://mariapolis.es/ckfinder/userfiles/files/11477522362.pdf In PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/39053517276.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/36417114664.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7223e2249---85059023715.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/nololirerugajav.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/35924058337.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/12192304541.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/68938364795.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/zimupefujepobafune.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/34683254319.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364c7c91f8f---jokalupuki.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/voxirilupebogixag.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/87461790471.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/35732246727.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/pikinisuzorozejuvitenubok.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/9070253073.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/28965561918.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/pozubi.pdfIn PDF document text
    • https://atrax.hr/files/62696644165.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/67575906553.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/15524982732.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/2530799700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=view+private+instagram+profile+anonymouslyPDF 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_off0000bf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF27 17064 bytes
SHA-256: 9f0bd688ac45901685df8f5da51ffbeab66177baf048f6e09abfe13e965635f9
font_01_sfnt_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 11036 bytes
SHA-256: 99420db540e54e45329f90efc526170af08dd97fa97614c6a0f6d60c323e962e

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