Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef184b900415b50…

MALICIOUS

PDF

81.0 KB Created: 2021-05-27 08:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 948f40781023f21fc295a874a4848e7e SHA-1: e9fc4406867f6ea2e9179b41a586b4b2424e1dd8 SHA-256: 7ef184b900415b50fe7c543d352872c5df0c07353d7beb656bf893887ce09316
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the overall structure point towards a malicious PDF designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/strik?utm_term=android+box+universal+remote+code
    • https://cdn-cms.f-static.net/uploads/4458407/normal_60473326e35ac.pdf
    • https://cdn-cms.f-static.net/uploads/4459170/normal_5fd09db1b2a30.pdf
    • https://cdn-cms.f-static.net/uploads/4445340/normal_6041ae24b80ef.pdf
    • https://jeporifitev.weebly.com/uploads/1/3/4/2/134265357/19277.pdf
    • https://cdn-cms.f-static.net/uploads/4481852/normal_601b7e6a7b5da.pdf
    • https://static.s123-cdn-static.com/uploads/4466154/normal_60016bec4b3b6.pdf
    • https://cdn-cms.f-static.net/uploads/4465388/normal_602a93d6cfa45.pdf
    • https://static.s123-cdn-static.com/uploads/4386851/normal_5ff58222bab3e.pdf
    • https://cdn-cms.f-static.net/uploads/4479921/normal_6041f68ec4474.pdf
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5fd66e5e671fd.pdf
    • https://forelidik.weebly.com/uploads/1/3/0/7/130775511/wudabo.pdf
    • https://cdn-cms.f-static.net/uploads/4477156/normal_60357702c5725.pdf
    • https://cdn-cms.f-static.net/uploads/4401972/normal_5fd987eac2413.pdf
    • https://visuriteja.weebly.com/uploads/1/3/5/3/135323353/xemekewerukadus.pdf
    • https://puxibaso.weebly.com/uploads/1/3/0/9/130968956/zefofamemekafepile.pdf
    • https://static.s123-cdn-static.com/uploads/4421205/normal_5fcd6e860b346.pdf
    • https://cdn-cms.f-static.net/uploads/4418166/normal_601e880c46870.pdf
    • https://cdn-cms.f-static.net/uploads/4476272/normal_603400b1a61e1.pdf
    • https://bewosugug.weebly.com/uploads/1/3/0/8/130814774/12476dd03d4.pdf
    • https://cdn-cms.f-static.net/uploads/4499329/normal_5fd19f4cbfe0e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/cda4974b-9672-4d6e-9fed-3976e96026b2/what_are_the_cooperative_learning_strategies.pdf
    • https://uploads.strikinglycdn.com/files/39ce8fef-fdb7-4dfc-bd30-8994db3bd563/nespresso_inissia_c40_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/42757d6e-4dfd-4cb1-9b5a-87d203069e28/suwarorixekonirijukudu.pdf
    • https://uploads.strikinglycdn.com/files/fc54d0ef-8686-400d-aa06-066a785a1757/minion_rush_mod_apk_unlimited_bananas_and_tokens_latest_version.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f16c.bin
763f4cf25534c47904140d9775e56956b11480034915a8d7c7cbde6c51719bdf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 5224 bytes
font_01_sfnt_off00010316.bin
3969725bd901ce1c2879af705380bddfe81ae17c446ab3136f6b9b1e05713bc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 10840 bytes
font_02_sfnt_off00012846.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 4324 bytes