Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7e9f894f6bfadf…

MALICIOUS

PDF

67.8 KB Created: 2021-06-04 23:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fba68824df1cc8623f06fd3aaa236ce0 SHA-1: 3bfe2d4d77b99d9795298e56f34003d1df97b915 SHA-256: 3e7e9f894f6bfadf82b3d61c7492d4c47a25e6741168c16e54c0c0b17e4172dc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable hosting services like Weebly. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7879

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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/pbw?utm_term=3d+paper+model+templates+jet+airplane
    • https://nosilagime.weebly.com/uploads/1/3/4/6/134613039/lulejilan-puzisimapoge-rumorok.pdf
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/8676954.pdf
    • https://cdn-cms.f-static.net/uploads/4484363/normal_5fe8a3908f1e2.pdf
    • https://kewetarutedur.weebly.com/uploads/1/3/0/9/130968996/rewelowibira.pdf
    • https://static.s123-cdn-static.com/uploads/4483072/normal_5fef82a4bc8bb.pdf
    • https://bidukupe.weebly.com/uploads/1/3/4/3/134348295/1405751.pdf
    • https://josaboduzez.weebly.com/uploads/1/3/1/6/131637311/xajesawemap.pdf
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/pogoxalu.pdf
    • https://sigegasolo.weebly.com/uploads/1/3/4/7/134732441/6178332.pdf
    • https://jebasiju.weebly.com/uploads/1/3/1/3/131381450/667e7e7cbcdf0.pdf
    • https://watowerapomos.weebly.com/uploads/1/3/0/7/130775357/vokot.pdf
    • https://jopulovi.weebly.com/uploads/1/3/4/2/134265775/31306f.pdf
    • https://static.s123-cdn-static-d.com/uploads/4490534/normal_60b4ee2842c3d.pdf
    • https://ledagesobefe.weebly.com/uploads/1/3/4/3/134367542/welutapof.pdf
    • https://gubetixe.weebly.com/uploads/1/3/4/3/134314982/4a4a8.pdf
    • https://ladofozaser.weebly.com/uploads/1/3/4/3/134334290/994934.pdf
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/4715442.pdf
    • https://static.s123-cdn-static.com/uploads/4365600/normal_5fde203b060a5.pdf
    • https://lalibirubifo.weebly.com/uploads/1/3/0/8/130873838/wexumuma.pdf
    • https://bamigifumu.weebly.com/uploads/1/3/4/4/134443618/9876483.pdf
    • https://sotinele.weebly.com/uploads/1/3/4/6/134640455/xebek.pdf
    • https://pafuxasakilufa.weebly.com/uploads/1/3/5/3/135327400/024c0f653d37.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/715c2ffd-4182-467a-8973-b4c909557662/vobulolipebuxikiladitaz.pdf
    • https://uploads.strikinglycdn.com/files/b113dd92-cd99-43a9-afa0-7a6032284db7/sedapav.pdf
    • https://uploads.strikinglycdn.com/files/6836afcf-13f5-4754-b823-531a9479ffb1/qual_era_a_populao_do_brasil_em_1920.pdf
    • https://uploads.strikinglycdn.com/files/6921d2eb-2ad6-47e9-91e7-c581cf3d6ae5/kelozazofur.pdf
    • https://uploads.strikinglycdn.com/files/f2c9f641-0349-47b6-89fb-9819053a8f1b/61149409763.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6de.bin
fbe626faa5fe82a5d42f77ceceb507fe844a55cf59ad5a0fc9bf84fc285b5815		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DE 5040 bytes

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