Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a07fdba8dbfabef…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 12:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c5d59b9341c98f9cfecde39bc93225f SHA-1: 7bc46acb8688ef93d2c44cda338c3a365595ad69 SHA-256: 3a07fdba8dbfabef6d2d3a0e059c62e44bed80dba643d3c928b38ba100a98bb8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://philabc.ru/uplcv?utm_term=sasuke+live+wallpaper+android PDF link annotation
    • http://slovoveri.org/userfiles/wajovigilit.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/japezomunade.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/d4880lvbvr4ra8eeurj5lpe1de/23050992654.pdfIn PDF document text
    • http://chinalabware.es/d/files/87671145016.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210903_E69130061EC6A722.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/mivun.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/gemeripozev.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/928699632.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/wezidasaxibogujo.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/dojumadadu.pdfIn PDF document text
    • http://flomojapan.com/upload/files/fijixemetejitirusozif.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gaxusafaxusisasaz.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/8145995807.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/97340955334.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/mukafafikunegataxarara.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/38899970392.pdfIn PDF document text
    • http://esen.life/userfiles/file/63529584421.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210911160659.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/29329614115.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/laxujupewukami.pdfIn PDF document text
    • http://yoron.net/up/files/46663243396.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/sivajonibesajuzugesej.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/laluwowarusegewi.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/sepedijorofadapovu.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/lelexofuwuxoz.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_off0000d22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22C 17652 bytes
SHA-256: 5bc9220ea013867f117b82476e2428053624d0462768b83d81da37adeb1ceb2c
font_01_sfnt_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 10704 bytes
SHA-256: cb6779818a72867ed8d5b9c30976fd9dd8113c03fbeefaa7281f42b8a69c3cd3
font_02_sfnt_off0001189c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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