Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cadcce5cb85dbe0…

MALICIOUS

PDF

63.5 KB Created: 2021-04-09 01:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2c1227808e4cb14a2355fea32446f68 SHA-1: b27b8f242d814e9a4d398a877153dc346f8c0dc2 SHA-256: 1cadcce5cb85dbe017cbf2aaa0066a1d47e048e71e58bb5224b680ae5adb5cb1
124 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. While no scripts were extracted, the PDF contains numerous embedded URLs, some of which are part of a link farm, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to reference a '10th chemistry book in hindi pdf', indicating a lure to entice users to open the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9586

Heuristics 4

  • 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://www.enwidth.com/sites/default/files/webform/resumes/fudigebifofonixetizitalu.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/80098342864.pdf
    • http://www.friendlycc.com/sites/default/files/webform/29579557159.pdf
    • https://ambrose.edu/sites/default/files/webform/fabifuturofutip.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/bedadijone.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/mikax.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/81826716543.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=10th+chemistry+book+in+hindi+pdf
    • https://www.vub.be/sites/vub/files/webform/ludazerubadariwevulefaxu.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/libovonudipiguriteg.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/52983615418.pdf
    • https://printandmail.princeton.edu/system/files/webform/68272747422.pdf
    • https://umatter.princeton.edu/system/files/webform/requests/72435273025.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da10.bin
63e7c6040479ae674c41b2a423aeaacd908a9eb9f9815c20e6c6e6157d3a3c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 5560 bytes
font_01_sfnt_off0000ecce.bin
6ebca793ecc114060004f1ee344a9115b8ebf31affda60f1bd3a1d1ca1336cd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 3336 bytes

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