Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf4dc0398bd5530…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 08:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9ffdd71c52651e8374d2bb089b549be SHA-1: b0c41f160945e79e188ee77c9fdd7becf30b9c46 SHA-256: fcf4dc0398bd553094b1ebc1b657a0d1847f3e3de683702ee74645072eced335
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable or suspicious domains, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the PDF and the embedded links suggest an attempt to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://digitaluzaktanegitim.com/calisma2/files/uploads/dutadepefemofasuv.pdf In PDF document text
    • https://mashura.co/userfiles/files/97958854604.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/puzedaxujifu.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/88104028338.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/mizuzekuxedegiguwu.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/14790161215.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/26323720858.pdfIn PDF document text
    • http://awards.nl/img/cms/file/11422744822.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/81299489474.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/zixezuvulixewi.pdfIn PDF document text
    • http://sin-hua.org/userfiles/tawexatifezarexataxobom.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/29485068564.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/26541637912.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/51001069958.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/85570051024.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/fonuval.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/sedefisekogufunub.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/45010963889.pdfIn PDF document text
    • http://analhospital.net/file/files/pabeloropa.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/tezijixunedevo.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/ravexozobamuvi.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/sivabumituvifakoxexopemav.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/fiwuvepatifofijorogiji.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/96347573637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+android+recovery+appPDF 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_off0000b20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA21 15164 bytes
SHA-256: c8b67320b5c89a31f23e65caf262dfedeb7db152dc4ad8f4921df48cca845017
font_02_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 10696 bytes
SHA-256: 124a7cb435fd0cc76971db968afe61a8cd2e5cbd6e5828d165135320fb523b79

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