Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ff76c935e6888a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-14 21:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 278a030672f0efbbdc0a11a99e95c338 SHA-1: c470058036c1b5a1316d316360940f0cffdfd2d2 SHA-256: 26ff76c935e6888aa063f2d1124c2dfa69e54e4ec6462a10ce49a6aa545e1874
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one with a 'download' query parameter, and a heuristic firing for a 'download button' lure suggests the document is designed to trick users into downloading further malicious content. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://krisoc.ru/uplcv?utm_term=simply+fly+ebook+free+download PDF link annotation
    • http://budapesticukraszdak.hu/userfiles/files/vugiw.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/48488852975.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/mudofumudugad.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/suzawamadipodewigogow.pdfIn PDF document text
    • http://sakem.org/userfiles/files/19058588405.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/63778306915.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/pabejopijabazeworir.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/japitijorinelijoridoledo.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/86585083773.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/firofefuwuxumur.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/v6a511vpgtip20ljuhsdk8fnt9/xidumoge.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/50654264313.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/81124927877.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/3010433501.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/14401535696.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/31813434882.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/34821924328.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/99160693721.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/86129374696.pdfIn PDF document text
    • http://hbaoge.com/upload/files/numepajesasefa.pdfIn PDF document text
    • http://newcityhk.com/userfiles/427466721.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/27380244644.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_off0000cdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 10900 bytes
SHA-256: d0010470e988a438ce5450307c056360f8c60c371cd80856aea17c42c1ac30cb
font_02_sfnt_off0000fed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 17020 bytes
SHA-256: 1ac78decdc57f3a0b3a8e162005cd6678695271784c88eb2544d651d2e6de01c

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