Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae8f130c2cb7d93…

MALICIOUS

PDF

70.4 KB Created: 2021-06-01 05:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1517df37aeac91d6c0aa06a7926ce89 SHA-1: 54c680b15a63468e34a51181f4586afc567ba1b8 SHA-256: 8ae8f130c2cb7d939c0f598bfcb764d2c483cc1949c6b4f8f5b8146e2f646ffd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7771

Heuristics 4

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/pbw?utm_term=how+to+get+matric+results+2018
    • https://static.s123-cdn-static.com/uploads/4464077/normal_5fcc8f7872693.pdf
    • https://xovajuvomupug.weebly.com/uploads/1/3/0/7/130776021/68057656c.pdf
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/5e1a7063463.pdf
    • https://lidonamu.weebly.com/uploads/1/3/4/7/134722791/vudosakipuxune.pdf
    • https://radunepik.weebly.com/uploads/1/3/4/6/134617153/6885365.pdf
    • https://ginegumogigoxi.weebly.com/uploads/1/3/2/8/132816185/e4c88dff0f4009d.pdf
    • https://kenagikapafixop.weebly.com/uploads/1/3/5/3/135301514/pamesuroxavuton.pdf
    • https://cdn-cms.f-static.net/uploads/4404296/normal_5fdc17dca524c.pdf
    • https://defuboxuzunusam.weebly.com/uploads/1/3/3/9/133986960/tipisorekitilokule.pdf
    • https://cdn-cms.f-static.net/uploads/4404738/normal_60549dbbb0b0f.pdf
    • https://wonidajubiput.weebly.com/uploads/1/3/4/0/134017859/9698521.pdf
    • https://cdn-cms.f-static.net/uploads/4413368/normal_605da1f465bda.pdf
    • https://dizegixevovule.weebly.com/uploads/1/3/4/5/134576191/7176556.pdf
    • https://wemodolitafuroj.weebly.com/uploads/1/3/6/0/136055174/sopem.pdf
    • https://cdn-cms.f-static.net/uploads/4412408/normal_6033b6dc561a5.pdf
    • https://cdn-cms.f-static.net/uploads/4496216/normal_5fd386c95c30f.pdf
    • https://fosovumukudire.weebly.com/uploads/1/3/4/2/134235423/2608552.pdf
    • https://cdn-cms.f-static.net/uploads/4501634/normal_6024bcd7760c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/41bd38a3-cddc-43b3-b256-4e0c8fb0e1a9/senufijererurepavosod.pdf
    • https://uploads.strikinglycdn.com/files/62be2e8b-8538-475f-9448-37d0d112e70d/73358045459.pdf
    • https://uploads.strikinglycdn.com/files/7f9104b0-341d-4820-a4a9-cbb0ec39b4e8/how_to_calculate_absorption_coefficient_in_water.pdf
    • https://uploads.strikinglycdn.com/files/35c314e0-b7f2-413f-9387-d1f478d49723/fililikavakuru.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e336.bin
5b04f91237ec3126daa1d1708a5ac231378331a95d5620ccb2d4585718d24366
pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 5468 bytes
font_01_sfnt_off0000f5e5.bin
d2fb83365bc3ae38af6440f4b096fc6a463f3694e4133dc6692dba699e355c68
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 11364 bytes