Malicious PDF — malware analysis report

Static analysis result for SHA-256 08fbccef4b546b21…

MALICIOUS

PDF

70.2 KB Created: 2021-09-14 06:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bfd8aeb1c63bb78cd9e8dcd9cbb2223f SHA-1: fedecdaaec0cbd2797b058da9a36b12025ec5d41 SHA-256: 08fbccef4b546b21060bb37b95644c5655ff9c3e43355645a7b3fde307a6eefc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the presence of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://infrive.ru/uplcv?utm_term=the+walking+dead+the+final+season+android+apk+download PDF link annotation
    • http://ykzn8.com/upfiles/editor/files/liliwexuverixela.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/vizanaliregafur.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/71542688029.pdfIn PDF document text
    • https://highrise.pl/file/63796777458.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/68012988125.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/56241115138.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/gifelodijikijawodudek.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/40238279670.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/rusilu.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/babaki.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/69927636740.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/zurusibexamogan.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/12940923079.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/zetasubatubosisanuwovezu.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/14/dozigolixuzibekoruxonije.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/sebisojuziguganetodavi.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/12837097834.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/kiwoxovuvovediginoxadinop.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/mopuxoxop.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/33596769552.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132d2fa7e3d3---22804901796.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/71098436954.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_off0000b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EF 15968 bytes
SHA-256: b777a8228643c2fbe233aa66e67f457df7bfc9cf84b4febbe51f63648d4d340a
font_01_sfnt_off0000da0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0D 10916 bytes
SHA-256: f56efcab6614cec7e5457fd4a4ea6b50a239063036ebfc25174c1c6de2748709
font_02_sfnt_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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