Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ade6131707055df…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 04:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89edd830d134c9b4a0626ea3a5defa5a SHA-1: 8c58af6f06dc2df264f01fbf77f9632a4a949072 SHA-256: 3ade6131707055df126845a82d1c0e541b97ccaa2b23b1552137a41b50124c62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially disposable hosting, and one heuristic indicates it's a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://bilateralmatters.org/userfiles/file/49387114582.pdf In PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/wasixobumizitawede.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210905174927.pdfIn PDF document text
    • http://asid.rw/userfiles/file/32939226618.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/73345540639.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/vikilu.pdfIn PDF document text
    • http://pneusmarene.it/images/file/85156079702.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/wiputazoniwanaf.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210902055327.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/62040027731.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/32063368546.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/91581493622.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/38014798218.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b021bc25a47497bc68889ca1c33c52a5/wimemunowejanizifoxik.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/migovoboredujemod.pdfIn PDF document text
    • http://baove247.org/upload/files/23922354915.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/pivab.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/daweraw.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/vufixejavoreba.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/falunikutevaxopave.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///nufaremejogovenugi.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109041943311677.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/71708636153.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/maxikonefimowoxasojed.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/kumelejonudogigom.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/74819184709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=stop+apps+running+in+backgroundPDF 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_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 18532 bytes
SHA-256: 242444b29e0e243c8dbc2142bb4c27fa8f5e4fdd125461874670d95ae2d881b6
font_01_sfnt_off00010d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12581 10916 bytes
SHA-256: 62e98d06b0208ae247a00dda743ac0fdb543cb0ea48c8242151a4ba13fcf03cd