Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf3b46e654d8238…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 19:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3263d2fafdf4b1dec17151b4442f8bd4 SHA-1: 1ac0b96e3d7656dce01931078a2f6ac54d04d7bf SHA-256: ecf3b46e654d82386f6fdf36e5269cd9c0f3802cabb3a13eaa9c68ecbdf0a161
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=igi+2+covert+strike+for+android+free+download PDF link annotation
    • http://gist.adrianlechowicz.pl/userfiles/file/lisuko.pdfIn PDF document text
    • http://rongqichem.com/upload/files/66211074049.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/55816674470.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/vopuvibibofugivakanako.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/wubekibixirurakuxogufek.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d3dcb6d52---32414185704.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/16237068343.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/89976622128.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/xafixivemagedumoziviwif.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/16788949198.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/pidoxisomifule.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/39074630165.pdfIn PDF document text
    • http://budka39.ru/files/98646496708.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/39278791312.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210926/file/88294852085.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/vobuxuxiraxofur.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/lukeke.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/8883587319.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/dugemuzegoludupedefapebex.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/75681580079.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/90127201811.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/wedefodexurikizobap.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/gamasi.pdfIn PDF document text
    • 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_off0000aded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADED 14612 bytes
SHA-256: 63c3749d662eac2a8e038c46e096c58a30848b40667ef0b0f7332baf13848068
font_01_sfnt_off0000d2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B0 10968 bytes
SHA-256: 912dedfc1b51a2aec12dca87691648a3629e0914d2338b344be414fa59af0a86
font_02_sfnt_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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