Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7f25e4f6d6cee6…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 01:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0dc0e5d13057f5b2c8be240dc037910c SHA-1: 44f3e0170c54e51892d9a0f0359866fcb7e218d5 SHA-256: ae7f25e4f6d6cee69607578fa7f4cad82af6bc083dcca34d45f03f59c8331b4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards the file acting as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://coretry.ru/uplcv?utm_term=mp4+codec+android PDF link annotation
    • https://halkum.rs/files/35718209994.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210904231803.pdfIn PDF document text
    • http://aa-nusd.jp/60822823465.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/94516646576.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/35105296541.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/88301380377.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/14431182472.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/bemibalefu.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/23875861616.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/36218624347.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/wodulo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161465709c779d---66167171987.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/wiwawuxixuto.pdfIn PDF document text
    • http://hidramaco.com/files/files/sozapevobunuteli.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/97018073157.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/xivomowavenowa.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/jipafu.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/7106787249.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/26723660726.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426e3520c1f---57778092094.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/63576052283.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/7946453739.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_off0000d1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A4 10264 bytes
SHA-256: 05f591c99991111a90de119b627c0977d5e88011965a7c764064f5c40a092b33
font_01_sfnt_off0000e8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 18440 bytes
SHA-256: df45b1f97e0ce96d4997a814dcc2bbdd1181ab0d5d137bfdc436fa2046ccdeca
font_02_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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