Malicious PDF — malware analysis report

Static analysis result for SHA-256 c195970190695446…

MALICIOUS

PDF

64.7 KB Created: 2020-12-16 07:55:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 770649668a5ee74cdeecc0a13b0377ac SHA-1: 716c6dfe82ab64ddfb27fe7f4623270018c76dcd SHA-256: c1959701906954468db2ef107e8e5c2d029ed53f1a64b426f58185d66d430925
214 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, and it contains multiple links to external websites, including a known malicious redirector. The PDF structure and embedded links suggest an attempt to direct users to potentially harmful content, aligning with phishing or malware distribution tactics. No scripts were extracted, but the presence of numerous external links indicates a primary function of redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/123?utm_term=2+corintios+5+10
    • https://cdn-cms.f-static.net/uploads/4390374/normal_5f8e7c444c0a3.pdf
    • https://zagesugob.weebly.com/uploads/1/3/4/3/134379314/lafetiwupujepupe.pdf
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f871b19a27bd.pdf
    • https://static.s123-cdn-static.com/uploads/4427828/normal_5fc79ce3a0b53.pdf
    • https://cdn-cms.f-static.net/uploads/4459466/normal_5fae28aa3c3ad.pdf
    • https://cdn-cms.f-static.net/uploads/4404113/normal_5fc070a319a3d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc65c3a24b06a7eb324d99c/t/5fc94093b1af4b3703397ace/1607024788450/touchdown_manager_apk.pdf
    • https://s3.amazonaws.com/biwuwukesazef/primary_source_analysis_tool_worksheet.pdf
    • https://static1.squarespace.com/static/5fc51f70f7cf8c7540462545/t/5fcb84618dcc5603bef55ae1/1607173218022/lerabofilowedev.pdf
    • https://static1.squarespace.com/static/5fc38c0cea4a794d5655cf02/t/5fcbea909708706f39a9d8c1/1607199378159/93927693720.pdf
    • https://static1.squarespace.com/static/5fc0da75085bf90c0efcd65a/t/5fc188c161e25426e1722866/1606518978319/jivezozavejegexudupad.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_off0000c3f7.bin
a4f1d30137360c389d259bcc894a97a7a10df17599fa6aa37210b239966c65c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F7 4908 bytes
font_01_sfnt_off0000d4c3.bin
13611dea8aa6493b99fba5125666378ebc87f64b55ece7f6b6bf274ef9427762		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 9828 bytes

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