Malicious PDF — malware analysis report

Static analysis result for SHA-256 70032aaddfcc5b1c…

MALICIOUS

PDF

89.6 KB Created: 2021-09-18 06:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 358e6bb95d40fe88020387f1a9a1a8ba SHA-1: 094b89a4f0e6b8995cd4816ea0b1174aba5d0342 SHA-256: 70032aaddfcc5b1c4f4c8ef2c14099807ba56d6a5f451c00eb5c76cd15ae624b
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains or appear to be part of a link farm. The 'wkhtmltopdf' authoring application suggests it may have been generated programmatically to serve as a lure, likely for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=unusual+words+beginning+with+c PDF link annotation
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b6cbd1c6---fetozavagetaxukojimasikes.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0910ac14c---84226276597.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/kefaf.pdfIn PDF document text
    • https://thepainter.asia/upload/files/timinosozarigotopafaf.pdfIn PDF document text
    • http://tzsunup.com/upload/49820066769.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/gavomifelogivemopolosak.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/vizakedudodoluxojanozex.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/84711461214.pdfIn PDF document text
    • http://imoroz.by/upload/file/jasenax.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/57984015301.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/36095638665.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/94995185145.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/rajux.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/64103103978.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/75153106079.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/nojolivirisodologil.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/pavufibotuxexesiv.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210904085616.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/74517818841.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/18580226747.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/renodogaka.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/12185501930.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_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 10980 bytes
SHA-256: 7785f51295f8f50bc55e862450d85db669670c3d0ff21dbb34570b06eabfe551
font_01_sfnt_off000110c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DB 18376 bytes
SHA-256: c9849074c5e9b666222d4e09d89186b1fa8fbc4eae7afda9cdde48e9ecb215be

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