Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7c3ef07f7e9703…

MALICIOUS

PDF

87.9 KB Created: 2021-10-08 04:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 74ade7ff6ed11b379b41dedd3b211d60 SHA-1: aec0b1d685481b618ffed028f1eed9291d17cc27 SHA-256: 2f7c3ef07f7e9703d95f8c5ecbfd9feab9f47b1623b76d9fc7f9751292bad5c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like nature. It functions as a link farm, containing numerous embedded URLs that redirect to external PDF files hosted on various domains. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://france-ex.com/images/blog/file/titufomarepamofipabemenom.pdf In PDF document text
    • https://nepoo.ro/app/webroot/files/userfiles/files/3253950049.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/siresudonurodudifezufup.pdfIn PDF document text
    • https://penal-garazh.ru/files/pepazov.pdfIn PDF document text
    • http://chinalabware.net/d/files/39905770984.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/zitekujazisof.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ceff1cfe87efe840f52a448776197795/lebakedabubafipitesu.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/32dbb2262a53256106828daf9ad90c94/16198888887.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/sadogumorufegetidubi.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/45981924614.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/13323166041.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/xusexe.pdfIn PDF document text
    • http://ijiantu.com/filespath/files/20211008061650.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/zaritaretoxamitivipoz.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210913_AE8AE216A22AEF4F.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/87954357635.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/92461222441.pdfIn PDF document text
    • https://mytopics.it/uploads/file/10394133866.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/16031255519.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/zuvufamipugijedurofa.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/lutebib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=a216+wcb+chemical+compositionPDF 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_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001042d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 19684 bytes
SHA-256: b319051cae760fdc28bc7cd25cc11de59252e686694cb3eab43b973f011364fe
font_02_sfnt_off00013851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13851 11088 bytes
SHA-256: 53a9b6c3bcab5b8d193ba360ff8de18bd6820c0cc92f159dc643951d579577b8

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