Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a519c3b2a07b8d1…

MALICIOUS

PDF

98.3 KB Created: 2021-10-05 12:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cae81be86de838e4d14c019d6d2dba35 SHA-1: 32533242e7af0ae80e1a567014e9317a891372c3 SHA-256: 6a519c3b2a07b8d16941d443e6cdc39ef1684dd79e5bffcff46a817625cc012a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a link farm or phishing campaign. The presence of these numerous external links indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://irlanc.ru/uplcv?utm_term=suits+and+sawdust PDF link annotation
    • http://olimpic.hu/ckfinder/userfiles/files/mopowukiravidonomufi.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/paduniruxiwolezo.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109170212202684.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/loterikerafebuz.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/zixubipetagowonew.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/1cadf0cf68866db2c086e9bbb3a1c69e/13691384411.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/58474543778.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/14620151996.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/nomutagatigipamifoxa.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615969d4d6ab3---51027819663.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/suweravizid.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/rugifefurivupabekowutanoj.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/sexovojaro.pdfIn PDF document text
    • https://sitarasign.ir/data/file/ketemidufeveginebunewoba.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/kilamopevajanojanefuv.pdfIn PDF document text
    • http://fittbikese.hu/files/file/midasusoluxojize.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/79052073063.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/12133673848.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/68988927191.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/93061370904.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/30178537522.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/51675998577.pdfIn PDF document text
    • https://keongracun.org/contents/files/wevejimulevidogozinavolu.pdfIn PDF document text
    • http://etkenkalip.com/files/vepumunusatam.pdfIn PDF document text
    • https://icbacademy.com/upload/files/winesoruxi.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_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 20488 bytes
SHA-256: b2e5da21421b4f3f046d55394585c61597ce71a20a82534b921e5f7bdeb2826d
font_01_sfnt_off00014d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D14 10104 bytes
SHA-256: a9e9c18c20f0f188935ce739a75b5d6548d4f1b45e2721657fa154e57f22ffae
font_02_sfnt_off000163c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1