Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0fdbe488e1bb054…

MALICIOUS

PDF

70.3 KB Created: 2021-09-20 14:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f40e63502ae393b6300ead7b70be11b8 SHA-1: 52e7b5841b4c46ed4eb6085a1fe2adfc05584440 SHA-256: f0fdbe488e1bb054c33e1441118fd32a4416d8039d52eb2063a4c616e6904353
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links pointing to disposable domains, indicative of a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the 'download button' heuristic further support a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=shrimati+21f+telugu+full+movie PDF link annotation
    • http://aven.su/userfiles/file/72607614288.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/tunamabaripabesuvewupow.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/90661321577.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/96271832402.pdfIn PDF document text
    • http://bresky.cz/res/file/44345020836.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/54561393492.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161467041a505d---dejexofi.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/raxaxipuniz.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/10611604602.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/20114180708.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/31116103487.pdfIn PDF document text
    • http://sayarbobinaj.com/file/dumebunesuzorolosujigu.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/ronopazebivikasutupavika.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/sogumojirolelurijazor.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/sokivepejurorenutasedug.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/1402041043.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/pevukawisesizitutekedaf.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/fixasagotigurigowi.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/53792912176.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/robefuzozapotozita.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/53786814029.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_off0000af30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF30 10804 bytes
SHA-256: fcf572bca75df14b220058c21d639004a5258c383eff3071f3c3d0ae5e34b1db
font_01_sfnt_off0000c843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 16392 bytes
SHA-256: 2698446aa0eb389e9126f71543c6ba1605306f775e507b34044469ff2355d448

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