Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2547d9da761b91…

MALICIOUS

PDF

75.6 KB Created: 2021-03-01 19:07:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9890ef832002eadd7caa706b9f01949 SHA-1: 42509b5b853b88b0d5c278176147cb4f2297ca24 SHA-256: ff2547d9da761b910a3d1d54e243be7f65002085c99e919f95505934bc2dd7f2
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The primary external URL, https://mezovuduw.ru/aws?utm_term=holmes+humidifier+cleaning+vinegar, appears to be the initial lure, potentially leading to further malicious content or phishing attempts.

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://mezovuduw.ru/aws?utm_term=holmes+humidifier+cleaning+vinegar
    • https://patelevikukel.weebly.com/uploads/1/3/4/6/134665122/3920340.pdf
    • https://nilizexuv.weebly.com/uploads/1/3/0/7/130739046/podok_bupixuj_gaxamibe_jodigubedowo.pdf
    • https://dapasubasawesol.weebly.com/uploads/1/3/4/3/134383907/7b80595.pdf
    • https://petozuxelilaf.weebly.com/uploads/1/3/4/2/134265439/2143118.pdf
    • https://cdn.sqhk.co/kisudosus/gc0Lujc/sims_4_show_hidden_objects_plants.pdf
    • https://fawimerena.weebly.com/uploads/1/3/4/6/134630635/tabowojilelexiros.pdf
    • https://xinuluparos.weebly.com/uploads/1/3/0/9/130969110/difat.pdf
    • https://cdn.sqhk.co/wekababu/hi4jahg/53258649014.pdf
    • https://verakolor.weebly.com/uploads/1/3/1/3/131379730/tufidoxewozam-zekivapoxijob.pdf
    • https://desujerobum.weebly.com/uploads/1/3/1/0/131070458/muxefobumejidopotor.pdf
    • https://vuterezupip.weebly.com/uploads/1/3/1/3/131380942/f8cb0dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bidemewufa/30016127572.pdf
    • https://s3.amazonaws.com/seriposuj/40650674350.pdf
    • https://s3.amazonaws.com/tokit/97006777014.pdf
    • https://s3.amazonaws.com/lixuzo/tuvani.pdf
    • https://s3.amazonaws.com/fizaxo/custom_action_bar_android_material_design.pdf
    • https://s3.amazonaws.com/pevarijidasalop/63874576748.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_off0000eb74.bin
b14eef7ef3990d5c2c543aafcd335512ec4ec0edfa856e5e436c0dd0f3a988cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 5456 bytes
font_01_sfnt_off0000fddd.bin
b45084aafcd01a0fe76389caedf9bba24da991781df4f05455f608b0ea483765
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 10492 bytes