Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec358544432fef2…

MALICIOUS

PDF

69.6 KB Created: 2021-04-02 07:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a5f93883501d0910e56d05739dc06ee SHA-1: d3ca20277b7bf8b7c941cc1bcc9f11652d7c77a7 SHA-256: 8ec358544432fef2066be70b70070c2befb42895ffe3df6e664cb7f64a913554
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting a phishing or SEO spam campaign. The embedded URL 'https://leonvi.ru/wix?keyword=yuri+ddlc+sprites' further supports the lure-based attack pattern.

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://leonvi.ru/wix?keyword=yuri+ddlc+sprites
    • https://sijokazodile.weebly.com/uploads/1/3/1/4/131454207/sowefu_xakabapelijaso.pdf
    • https://cdn.sqhk.co/liminekaj/AgePHUv/22773221083.pdf
    • https://kozugirufeji.weebly.com/uploads/1/3/4/8/134884007/vezivukevejotasizuw.pdf
    • https://cdn.sqhk.co/minutakumu/Y8kgVjg/huawei_p9_lite_android_7_frp_bypass.pdf
    • https://kazodorog.weebly.com/uploads/1/3/4/9/134904699/dc30adfc3323.pdf
    • https://jowomuzixife.weebly.com/uploads/1/3/4/6/134634296/buvabizo.pdf
    • http://pitushok.space/pevigonuzujizasozasozwkonu.pdf
    • https://cdn.sqhk.co/rovujesox/hfhbFic/vevedoduzijani.pdf
    • https://webuseki.weebly.com/uploads/1/3/2/8/132814302/dimiwi-defewa-xamap.pdf
    • https://cdn.sqhk.co/mebosuxular/DhjQvAj/46639391830.pdf
    • https://cdn.sqhk.co/litanamamusi/dglRhhj/mars_power_industries_guide.pdf
    • https://malalufapavi.weebly.com/uploads/1/3/4/4/134481779/234677.pdf
    • http://giocodigital.fun/68912459572fwqmb.pdf
    • https://cdn.sqhk.co/litigoruf/gfigfnS/best_hits_of_ac_dc.pdf
    • https://gijufonuvaxi.weebly.com/uploads/1/3/4/8/134874477/7355825.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zebarufuridorur/20615393970.pdf
    • https://s3.amazonaws.com/xalasawu/31507208456.pdf
    • https://s3.amazonaws.com/vavapekadoliti/damping_sheets_in_pakistan.pdf
    • https://s3.amazonaws.com/bepukuba/bronchite_chronique_cours.pdf
    • https://s3.amazonaws.com/vikukinumet/fipovisotixob.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_off0000d424.bin
fb2e8a422c59bb6778a674c5a1c07a44f154aa10033e810ca34270cffbb1acec
pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 4820 bytes
font_01_sfnt_off0000e49a.bin
f9392fd6cc81f88837e758583a342a2e96428ad90178e93aacdd9533e115c916
pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 10700 bytes