Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6649b88583477ba…

MALICIOUS

PDF

73.2 KB Created: 2021-10-12 13:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 642b7667107096c6c5a8be09205ce893 SHA-1: b214b0fe5f82e41c45534f7820e3b439c2b96ab9 SHA-256: d6649b88583477ba87e7c97153f7de65297ca8935c993738213c907a8e206b39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and heuristic firings point to an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://lynxitservices.com/ckfinder/userfiles/files/dapit.pdf In PDF document text
    • http://parkingparts.com/Upfiles/file/xesojipixelami.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/95868915802.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/86573578610.pdfIn PDF document text
    • https://ons-station.com/editor_upload/file/jorefebevofadapabot.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/zavod.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20211012128424909.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/rigizonenasugudaz.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/donasenu.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/sofozerijikapebigipuk.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a29f0eb4f0---fotedisejodevirij.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/nuwoxipoduxowufim.pdfIn PDF document text
    • http://ranchobg.com/img/file/63776333292.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/deguwemiku.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/lazomosukesoxugexonifip.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/50671934217.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/rknlf3btnj262t56qe3c81he8k/zasixamapamazororogizubiv.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/tovoxapetekufobidawi.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/wadofizaz.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/50527074479.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/46906594160.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/18582880582.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/pokisiwitirorarupuki.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/80627823241.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/92212124691.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/7xhmvLXWVJc/uplcv?utm_term=chemical+properties+of+clayPDF 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_off0000be7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7A 10784 bytes
SHA-256: 52a593e3a510e4be88e54002bd35597ace3754c82f9c0b4598ba2bc4e1983b9c
font_01_sfnt_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 15960 bytes
SHA-256: 84206c97487a28b64f29d8c354ecdddd3a8b8ffb61d5ba8c543f22e756a9de2c
font_02_sfnt_off0000ff41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1