Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0087bd96e1d160…

MALICIOUS

PDF

66.3 KB Created: 2021-10-01 18:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 023b7e3b1a2c2ba0705b7b4da3fe4ad4 SHA-1: c98c4a4dda3c1b087a85aec5595d5ab1ea8910c7 SHA-256: 0b0087bd96e1d1605ac3b25de50653bb04ff6e2e340137c77a433e4a9986cbed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on various domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ylphs.com/ckfinder/userfiles/files/53262197132.pdf In PDF document text
    • http://jawarakreasi.com/file/tedolifupirifotomisejadi.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/sununugegajuralozukim.pdfIn PDF document text
    • http://12shio5.com/contents/files/xumemamuluzo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/naxosigumirararipasijej.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/25104067038.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/gabilufakesirujelozogeti.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/60538864260.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/74378468039.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/wirud.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/refegodukidowuxezolitap.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/foxufezawupitaxi.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/84289448451.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e98c79b2fb---96072904791.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/44132722875.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/41189497268.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/96002336140.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/morewitegevafij.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/sipepubugewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=apple+store+android+appsPDF 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_off0000a94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA94C 14148 bytes
SHA-256: c72de3c7740bca1eeb1d4ef2b86b0c64174e60d4e1b389a0099ae60853182977
font_01_sfnt_off0000ccca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 10368 bytes
SHA-256: 426b858d5e987cf638b491091d340d72188039f6caf2da73cfcbf92d2bcbe78d

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