Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2930313efbdf77…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 15:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 267d7b11a53328a11f46c2612eabde87 SHA-1: a367fa6446fad64c84c7dc8ba35a13e2d8058360 SHA-256: ba2930313efbdf778ad51b89e9f9cb7bb983e8298a5339e530397b0eaddc2892
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. The embedded JavaScript likely facilitates the redirection or download of a secondary payload, while the link farm structure aims to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://co-wemart.com/careeruserfiles/file/45410975510.pdf In PDF document text
    • http://nuovartea.eu/userfiles/files/numiwivudobijurarudusuja.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613897401ae35---24551977867.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/65107757906.pdfIn PDF document text
    • https://euchebnici.com/img/file/setanabodek.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/xasutadapatazozep.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/26977904870.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133621d870af---33627702963.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/14828593958.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/vivezugilelasopafaxorep.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/ginibejufojomux.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/fozividowifozipefomorema.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/69817165995.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/darewamijopagabudivew.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/nagevirija.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/zokomujopelunudojum.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/45868050802.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/nanalozabafagi.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/92048814562.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/78143979582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+robbery+bob+1+mod+apkPDF 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_off0000ca97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA97 16580 bytes
SHA-256: 2a4bdb9be7c71f9058020a2d8935f149fb876226dedcc4ed72d3125e04d3e501
font_01_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 10680 bytes
SHA-256: df00ab20da042f3d8043d72d81cf2a4e3573b4321538668779db9aefe5d39552
font_02_sfnt_off00010db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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