Malicious PDF — malware analysis report

Static analysis result for SHA-256 269271a80f28488e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-24 11:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1fe0a7253faec4748570365a01c73af SHA-1: 1251e065dc1012c3ff473e2ab34937646bd63cc3 SHA-256: 269271a80f28488ec70b40785abfde033f67f07fa8a28a26937e731dcda25377
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://laborke.ru/uplcv?utm_term=anime+droid+apk PDF link annotation
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/88872362898.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319bf52e3c8---xosalaroviwifi.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/ritoguzikobanuxewiw.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/mirofizavuruwak.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/mosebu.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/lapojigigeloluxam.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/zunetifeji.pdfIn PDF document text
    • http://househouse.it/userfiles/files/12671873401.pdfIn PDF document text
    • https://palet-school.com/files/files/neribo.pdfIn PDF document text
    • https://euchebnici.com/img/file/91863461491.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/89203040481.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1631158457/file/81351639618.pdfIn PDF document text
    • http://splogservice.ru/content/files/56009376204.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/30836440230.pdfIn PDF document text
    • http://artospace.com/pics/file/77695813594.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/94276775507.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/71983248802.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021092414283081.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/98148463153.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/pujikutowaxobutix.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7f8b3c9de3443fe2f1f1574edac1f355/zamoninikeg.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109111205576665.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_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 10312 bytes
SHA-256: 7c4c7f3468490c0e3e489caeadf7bbd3b00def7de050b08d452fc7912dd79868
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 19652 bytes
SHA-256: e7cc9dcfe4ceb290a7adae8ece779ea1367f2d47c2d4c363931a068899de3747

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