Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e01308ac066938…

MALICIOUS

PDF

77.6 KB Created: 2021-05-19 22:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9912dae02f9d48526ef8060e8a75742 SHA-1: dd2331db7bfed6eac424b3ad87a178c567d53dfb SHA-256: e8e01308ac0669389266a19322ba66b8957bbafc493fbdd7d525b81a887da43a
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 phishing or malware distribution attempt. It contains numerous external links, including one to 'zajinet.ru/strik', suggesting it's part of a link farm or SEO spam campaign designed to redirect users. The document body, though heavily obfuscated, contains text related to 'yeezy boost 350 v2', likely a lure to attract clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=what+size+to+get+yeezy+boost+350+v2
    • https://cdn-cms.f-static.net/uploads/4369524/normal_601af95cd070c.pdf
    • https://static.s123-cdn-static.com/uploads/4406228/normal_5fe1acc1ec1c6.pdf
    • https://cdn-cms.f-static.net/uploads/4454678/normal_60488b0d76408.pdf
    • https://cdn-cms.f-static.net/uploads/4470218/normal_60152a77ea305.pdf
    • https://static.s123-cdn-static.com/uploads/4483873/normal_5ff4de31a1af2.pdf
    • https://cdn-cms.f-static.net/uploads/4382405/normal_602e62cf2dc23.pdf
    • https://static.s123-cdn-static.com/uploads/4407087/normal_5fdef410f414e.pdf
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/dobubijemulafan-gimemuxawili-bareju.pdf
    • https://cdn-cms.f-static.net/uploads/4495058/normal_604a76d41ead5.pdf
    • https://static.s123-cdn-static.com/uploads/4365539/normal_5fefd4cb44d27.pdf
    • https://static.s123-cdn-static.com/uploads/4481834/normal_5febb511941f9.pdf
    • https://cdn-cms.f-static.net/uploads/4495854/normal_5fe7673f81e93.pdf
    • https://static.s123-cdn-static.com/uploads/4384647/normal_5ffabe9cde232.pdf
    • https://static.s123-cdn-static.com/uploads/4486036/normal_5fe31b84c533b.pdf
    • https://static.s123-cdn-static.com/uploads/4413110/normal_5fec0056552cd.pdf
    • https://static.s123-cdn-static.com/uploads/4378856/normal_600980b8a2fb1.pdf
    • https://cdn-cms.f-static.net/uploads/4413007/normal_60533a212fb36.pdf
    • https://cdn-cms.f-static.net/uploads/4476939/normal_6038b92b8bcfb.pdf
    • https://cdn-cms.f-static.net/uploads/4473654/normal_5fd8fb06160fb.pdf
    • https://cdn-cms.f-static.net/uploads/4489853/normal_6052d0d54ac53.pdf
    • https://linugotozoluj.weebly.com/uploads/1/3/4/6/134662393/viwafa.pdf
    • https://cdn-cms.f-static.net/uploads/4409113/normal_603cd08449742.pdf
    • https://zonotilikoper.weebly.com/uploads/1/3/1/0/131071062/lukeka.pdf
    • https://lumuvimusu.weebly.com/uploads/1/3/4/7/134719948/4694ca11c5ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000ef03.bin
46a25b935f3d1579b9007c8e023bec246ca60eb21e5bd8405da1f95b96b5720c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 5748 bytes
font_01_sfnt_off000102bc.bin
efa58675e8eb479d3b68cdb74ecab2dbc896a48e018cf00ec2a210a0d8e2e3e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 10596 bytes