Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb05446ef566084…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 21:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a0b9d5bc5edd845871ebc4551aca9b45 SHA-1: a502c79322923395c74bdc6cb34146293a7de018 SHA-256: efb05446ef5660848cedf3a5ffbfbc123044a31e663841b0e53ac66ad0ee9cb2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded URLs pointing to external websites, many of which are part of a link farm hosted on disposable domains. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=vlc+apk+smart+tv PDF link annotation
    • http://shamayachts.com/upload/file/38860785002.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/51778432312.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/31631247875.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/15098133932.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/lorag.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/damajajafepukepukopep.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/puvaxavez.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/zaxapefowedo.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/53pt0iruchb8h62v4hvcpsene1/pufoketitugidezexalexej.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/22754066758.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/26583456551.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/ganag.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/24833549904.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd9bf23fb---48338273182.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/4422945079.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/wugefag.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/wokonijubarugasomivegem.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/mexakifofetagaxepidabiv.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/vuzosawifutukope.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/miwalaxitapa.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/9777723998.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/ranugarop.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/mikanim.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/87788059006.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_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 10212 bytes
SHA-256: 32624cd4bdfbe7a3bcaccac71417890e35b32e8669d3d28d70757e45923e6ff6
font_01_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F71 17632 bytes
SHA-256: 7a40b60566844a5d3227572f2cffe456d4ec43130edd05a4e5603a67a1dcec8d