Malicious PDF — malware analysis report

Static analysis result for SHA-256 2665444028eca3f6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 16:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d88e348502163a313dd7610f22273d9a SHA-1: 9b9803f03622cfa85152d14779d72961a56160c3 SHA-256: 2665444028eca3f6fe6e05c9535bdf8587d2337a4232654716e2e7e5a084f7f8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF that contains numerous links to external PDF files hosted on disposable domains, indicative of a phishing or malware distribution campaign. The heuristic 'SE_SECRET_RECOVERY_LURE' strongly suggests the document's intent is to trick users into revealing sensitive information like private keys or recovery phrases. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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=electrum+android+app PDF link annotation
    • http://orderkiwicafe.com/uploads/files/linowunawanimaz.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/67834074767.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/vorimoluzozunovalujiravud.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/rizoputilen.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/42345380810.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/kasoxanufub.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/pikuxojewawifokijarerew.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34375595742.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/zevivesuwi.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/83889716969.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/xebeliki.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/55387149171.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16130f7042c15f---vazapuguxuri.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/95593401924.pdfIn PDF document text
    • https://wecareprogram.org/images/file/40661476961.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/6070826493.pdfIn PDF document text
    • http://trubaopt.ru/content/file/mijobatixizevikiwika.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/fedelotatetonifivazixim.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/funibo.pdfIn PDF document text
    • http://bwc.lt/i/zijovemugopexeliw.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/bitovopu.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bebasira.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/giguxunizefesuto.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_off0000bc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC99 17356 bytes
SHA-256: 0a8f71b7f21654889eeaf63328989e3e6688cc580b978179babd1548486443a4
font_01_sfnt_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 10592 bytes
SHA-256: 2af76f253557d5351bd1c0318edab07f3cc7f4d6a5eae44c54d586db2b1255f4
font_02_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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