Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba069f780c163cf…

MALICIOUS

PDF

92.1 KB Created: 2021-09-22 09:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf1db72218d0c08b9f36f157f81b9bfd SHA-1: 1e3746b010db11f315a07d7b32911f2c90d74f4b SHA-256: fba069f780c163cf5ce9c5c9bc086305548e916a6289137df590ebecfc895a60
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 are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of UTM parameters in some URLs indicates tracking for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://queure.ru/uplcv?utm_term=download+instagram+for+android+4 PDF link annotation
    • http://xfswchem.com/upload/files/84250995205.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/jukigevi.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/33410173197.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/90393003994.pdfIn PDF document text
    • https://kar360.com/resimler/files/76477362851.pdfIn PDF document text
    • http://topp.pl/_topp/file/xosedonevodopusupamigujez.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/88057769238.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/texawitorufuvedamoj.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/57754184829.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/54ullgtl2n7m59n69ub9a1qn87/nubitekedafe.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109180711102152.pdfIn PDF document text
    • http://miminku2.com/contents/files/bowopajefigolakerowele.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/32696498396.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e94ff0a4b5101b4970d304896acf4767/gejiwujigokojegu.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/toremujimawava.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/kifuleveradivunu.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/fodutevinomu.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/32058680478.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/4295387045.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/kutitifafubemox.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210903141950.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/matakonotin.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/xezujeleg.pdfIn PDF document text
    • http://beiks.info/public/file/nemuzoruzozuzotivokez.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-21/20210921174917112397.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_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 10728 bytes
SHA-256: d3670afbafd8051b2cad80db4b3bb6427f2eb1725e75fb2abb5069de77409248
font_02_sfnt_off000132bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BB 18572 bytes
SHA-256: 4e3c76e652789cf328a8836b998c465ff1ed7d36e344b63d085a3da24981086d

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