Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c62a898a2ea1a99…

MALICIOUS

PDF

71.8 KB Created: 2021-04-05 04:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7e7d73eaafec77267272869e5d3221f SHA-1: 3d810bb39286cfda743674950ad7a9e39faa62c7 SHA-256: 7c62a898a2ea1a99ce27884635c5f5bf022972987a3eafdd4deb44b438abff21
156 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF structure indicate it is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-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
  • 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://lozipotod.ru/wix?keyword=fuji+camera+repairs
    • http://ziduruwekomowob.iblogger.org/amomum_compactum.pdf
    • https://wabibazo.weebly.com/uploads/1/3/5/2/135295983/1446067.pdf
    • http://wuxapogetal.iblogger.org/wijoj.pdf
    • https://taxupolejunak.weebly.com/uploads/1/3/4/6/134663048/f50603b064d416e.pdf
    • https://karelevoziwoda.weebly.com/uploads/1/3/4/7/134718414/7064958.pdf
    • https://taresazafo.weebly.com/uploads/1/3/5/3/135335901/3735689.pdf
    • http://xtw2.club/javascript_definitive_guideazu2r.pdf
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/0b30418c.pdf
    • http://hellesypakk.online/ramanichandran_novels_free_download_list4y8nu.pdf
    • http://lnstagramverifiedbadge-media.com/how_to_use_a_manual_inflate_blood_pressure_monitorj22k7.pdf
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/6419515.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zalomi/xamiwamanitinijej.pdf
    • http://dimuwebogikufuf.rf.gd/94409962291.pdf
    • http://gizamowamuvo.epizy.com/98401417956.pdf
    • https://s3.amazonaws.com/pipaneku/bengali_calendar_free_for_pc.pdf
    • http://gudanomakorake.epizy.com/toxikisuleru.pdf
    • https://s3.amazonaws.com/xiwevitox/fukorazarorebu.pdf
    • http://gemimixobisuju.epizy.com/bridal_march_sheet_music.pdf
    • http://weketabafizevu.epizy.com/xumoruziwutomebud.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc8b.bin
cfe9a04b6cbfa8fe8af38df9bee0c2fc555efa2b9838ab1652b7aae6bf7cb6fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 5076 bytes
font_01_sfnt_off0000edbd.bin
60b16913228ae2be68e63adca8760de0823ba0910991cd36012ff1b86fc5d849
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 10792 bytes