Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a97d5bf3a1bd53…

MALICIOUS

PDF

67.1 KB Created: 2020-11-20 09:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 008bd793e219652171e86143f84c1446 SHA-1: d1e34f5abffdff9560237c30dab0e75b17906142 SHA-256: 08a97d5bf3a1bd53044983a2e607afba29adb77f0df4588776e6716d92088379
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link farm and redirects to known malicious infrastructure, disguised as a free antivirus download. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and embedded URLs suggest it's designed to exploit users by redirecting them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/aws?utm_term=quick+heal+boot+scan+antivirus+free
    • https://cdn-cms.f-static.net/uploads/4369487/normal_5f99c5c267568.pdf
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/bovudijiperude_kagemefazut.pdf
    • https://cdn-cms.f-static.net/uploads/4372074/normal_5f8abdc1004d9.pdf
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/4265599.pdf
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5fa0b0f007616.pdf
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f931837e59fa.pdf
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/4902000.pdf
    • https://cdn-cms.f-static.net/uploads/4383128/normal_5f9cdaf65f170.pdf
    • https://tusukufuduma.weebly.com/uploads/1/3/4/4/134458322/4d24025a5a15c82.pdf
    • https://nidixinaxob.weebly.com/uploads/1/3/0/7/130739699/rezenamupo.pdf
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/rizojudozemasaregeba.pdf
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/6425047.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/396f81cc-b2dd-48b4-8766-1f6a8a2a2866/79216040842.pdf
    • https://s3.amazonaws.com/bidivo/542485801.pdf
    • https://s3.amazonaws.com/tadovu/wilfred_owen_dulce_et_decorum_est.pdf
    • https://uploads.strikinglycdn.com/files/bbb95728-6be6-4dfc-a638-8fc626c064b9/40225497922.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_off0000c9b2.bin
dad086fc8e6a839a8ba551375d441943fe708eea9f6241c7a70373dc60eb2b2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B2 5296 bytes
font_01_sfnt_off0000dbb8.bin
7dd741058970df1e148646048fbbc87922a387ac035d212305ff9a521fd3a6f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB8 10424 bytes

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