Malicious PDF — malware analysis report

Static analysis result for SHA-256 2301e294b847fd8c…

MALICIOUS

PDF

72.0 KB Created: 2021-09-09 14:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 63eb2a20bd391f128303366850cb53c1 SHA-1: 2d02e59651a0bc120f5ece10ccf34ee8800c9dc0 SHA-256: 2301e294b847fd8c7ca4cfe09c62332b3492a81b9701b20443bf23cc0e53c3f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on domains that appear to be link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting multiple PDFs with minimal distinct hosts, further supporting this assessment. No scripts were extracted, but the presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=iphone+unable+to+receive+text+messages+from+android PDF link annotation
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/kewotepomugefofujiroz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6a7064d8---rewuxelokusegozifelaxit.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/66570080319.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/sulutun.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/55781831131.pdfIn PDF document text
    • https://begili.com/uploads/image/files/zimavepa.pdfIn PDF document text
    • https://rosycaffe.com/file/34301444115.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/demokamitagawaleliforu.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/kabotariz.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/26789839685.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/42232791503.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/puwijas.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/dezajopebirajid.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/47446786221.pdfIn PDF document text
    • http://hocomesun.com/upload/batejitawipudiden.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/tuweruboxo.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/2037058536.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/velapemebomo.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/kunizakudibuzug.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139265b3af06---8029674116.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/42224599263.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/siperoramemivonu.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_off0000b553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB553 16636 bytes
SHA-256: de94dca9ef97d4ae29dee7e7e8cabe691b35c587ff59f1d1df98c4ed22f122f2
font_01_sfnt_off0000dfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB6 11424 bytes
SHA-256: 803854df30a4ddedcf2191d4d028ca7519a7a36a3cc06e52d415c1d45a67cd0d
font_02_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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