Malicious PDF — malware analysis report

Static analysis result for SHA-256 caeb83f9fc3e07ae…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 01:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8e4f2fe50306aba5125302402eb36a2c SHA-1: d02fbfeaaf9a5cf9f4908aee36d08e0d4d2f4a3d SHA-256: caeb83f9fc3e07ae0ea2c009b5f826fbc63a8622e2b6669d309b268a77f5eb63
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URLs, many of which are structured as link farms or disposable hosting, suggesting a phishing lure to download further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the ML_NYX_PDF_MALICIOUS flag strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=best+gaming+emulator+for+low+end+pc PDF link annotation
    • https://spandoekland.nl/userfiles/file/31701855624.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/juvoj.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/97892157881.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/nagatoxefokemen.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/46839132363.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/kivijebubodigonubo.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/finukilesonewi.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/70141543584.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/47006082611.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/65690485510.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/fimobabikorosabowogigar.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/vujagotiximujenavodu.pdfIn PDF document text
    • http://punaide.com/userfiles/files/balewimomepizudojizi.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/46668758821.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/2513579142.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/modarivugitolukiz.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/49008780884.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/taroredixijijuzewetesipev.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/75475950147.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/98774982909.pdfIn PDF document text
    • https://rajaunited.com/contents/files/lakeju.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090504133391.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/34628676523.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/42098716914.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_off0000c25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25E 18724 bytes
SHA-256: 615efef564e7a15fd81ee48b214efb6f407f003fc9781cfd1320fb1556665aa5
font_01_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 11204 bytes
SHA-256: 6498d108dbaed1a0ed94dfbe56c7ad8646a423ba28d989303f6c5ebc2738a5d4

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