Malicious PDF — malware analysis report

Static analysis result for SHA-256 48eb78dca689ca8d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 12:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e4126c05abd711a1ffde11a8cf0207d9 SHA-1: 4a63fd500869220d8dc045f138a42de99efab5a4 SHA-256: 48eb78dca689ca8dfda7f0206f1bef6234a282116254ba9dcc6fd67c0f7fecdc
134 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to trick users into downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=free+ebook+pdf+download+sites+without+registration PDF link annotation
    • http://sameiroeventos.pt/ficheiros/292836881.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/43751693188.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fewolizukowomozimaded.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/kirozolegisotipujodenel.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/18414166976.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210912040856.pdfIn PDF document text
    • https://terracell.pt/images/file/32679968652.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/89230603449.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210910_151448_178.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/73889900154.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///jijizagureniverurefefawu.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/wusuvizujadazumuduxeniwu.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/55163987020.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/neganixobodexedunizagiku.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613962679f086---81473025872.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/bematamodipukuxije.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/79973650272.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/nixivavi.pdfIn PDF document text
    • https://desco.scp.hr/files/mawasimiga.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///bunujevivexifimu.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/20325568315.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/80237500039.pdfIn PDF document text
    • http://capital96.com/userfiles/file/44634507119.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_off0000d5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 16968 bytes
SHA-256: fba7d1e5811b4f186ebceed840afa815d001067b687b4670652f08f7e15b6638
font_01_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 11172 bytes
SHA-256: 483b7fc15bd2e3310bd202db53c819ef2ff668878d6fce6df07461d00e3541c1
font_02_sfnt_off00011b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1