Malicious PDF — malware analysis report

Static analysis result for SHA-256 127e59b822a2bcd0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 14:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d25e872d599cfe252d96b089e52b51bc SHA-1: 26352d1ff83b76b12641661f2fa4071287b2c71a SHA-256: 127e59b822a2bcd02e667cd453c5df0f928ac926dd9e7b90b22ad83e6698adf3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The presence of PDF-specific heuristics and embedded URLs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=mod+apk+apk PDF link annotation
    • http://alfavs.eu/userfiles/file/korokokodejilubi.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/pasaz.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/29785632288.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/vujonuketis.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/lifipinokegulugerorumed.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/67355539163.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/25644351924.pdfIn PDF document text
    • http://uhorder.com/upload/files/piwudaxotaluxalu.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/wegetasi.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/89174524713.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-11-14-45-38-6kKozSIJ.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/fagudomi.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb37d8e3b4---56065986104.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/lujamufawu.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/kajefakerugekure.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/xadozefibuvopon.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/lefejuzisujominalovonak.pdfIn PDF document text
    • https://5udua.com/contents/files/1367079398.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/22731766488.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/guvonamowex.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/34666524057.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_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 21284 bytes
SHA-256: 7180448b57e1209d0c43c419a9f872b541e762a848dec51f85ffc0624b8279e4
font_01_sfnt_off00010d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3A 9732 bytes
SHA-256: 0f1833b51de73d159bd24ed032503ff3249e8ae979a63139b38716ecad1de64a
font_02_sfnt_off00012287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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