Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae49da8bb49d4e5…

MALICIOUS

PDF

69.6 KB Created: 2021-03-01 03:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab5b3d5eddf9140aa2c74b0586087d84 SHA-1: 24167e06c69e00e13031913bb93ca09690b7bb24 SHA-256: 9ae49da8bb49d4e5c6cb0208ad1b60641b44cbf875c97b36fe566489448d181d
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various PDF files hosted on external domains. The primary lure appears to be related to gift card balances, as indicated by the URL content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware via the linked resources.

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://jacksth.ru/strik?utm_term=how+to+find+balance+on+vanilla+visa+gift+card
    • https://cdn-cms.f-static.net/uploads/4421342/normal_60223da1e785a.pdf
    • https://cdn-cms.f-static.net/uploads/4468536/normal_5fd67061e7d10.pdf
    • https://cdn.sqhk.co/pogezasamu/TwTgejb/67247347233.pdf
    • http://moviesaddaa.online/65700951876tubhs.pdf
    • https://cdn-cms.f-static.net/uploads/4464065/normal_5fd7b3951f931.pdf
    • https://static.s123-cdn-static.com/uploads/4377116/normal_5fe5ae76be887.pdf
    • http://leomannapov.com/mavofodisawudisubixojnwpcv.pdf
    • https://cdn-cms.f-static.net/uploads/4379221/normal_6025f33d3f865.pdf
    • https://cdn-cms.f-static.net/uploads/4391925/normal_60299690263b6.pdf
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/8cfc350.pdf
    • https://mabalajobiken.weebly.com/uploads/1/3/4/0/134016714/gubumilobo.pdf
    • https://static.s123-cdn-static.com/uploads/4388063/normal_5ffa4d766bd48.pdf
    • https://cdn-cms.f-static.net/uploads/4384304/normal_601ca3cda9749.pdf
    • https://static.s123-cdn-static.com/uploads/4367964/normal_5fc93d83dc88a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zagubip/azure_sql_dtu_vs_vcore_performance.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_off0000d3e4.bin
2019ee0e1222520fc99f73d1cd45d9f9bef5a59829bc30fe1398596a76fbbb37
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E4 5440 bytes
font_01_sfnt_off0000e68f.bin
bc0b299dfcea3232b49374953189d97a98a5e4b8c95ff48c5be55453d13bbda4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 10136 bytes