Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ae750695a7434b…

MALICIOUS

PDF

74.6 KB Created: 2020-12-28 09:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bb3a243982bcbc91acd278e5a8b7cc0 SHA-1: b5bb88b8b70ba1f0c4c589c79ed6314e46aadab3 SHA-256: 22ae750695a7434bd8e9aa8360a18b1de34a0fc357d0f8e51bfafc1332efce32
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution. No scripts were extracted, but the primary attack pattern involves directing users to external malicious sites.

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/strik?utm_term=super+mario+3d+world+zackscottgames+world+7
    • https://cdn.sqhk.co/libibajuzumu/jehaWif/dhoom_2_dhamaal_full_cast.pdf
    • https://cdn.sqhk.co/wotutovebo/Nifjeii/kupetoniwogefedurawoxarow.pdf
    • https://cdn-cms.f-static.net/uploads/4443799/normal_5fb265eca8340.pdf
    • https://bafumujem.weebly.com/uploads/1/3/4/4/134498711/ramezagomipu.pdf
    • https://sitoluvumoroge.weebly.com/uploads/1/3/4/7/134762666/f9299922.pdf
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/6746505.pdf
    • https://wetifojijebene.weebly.com/uploads/1/3/4/4/134474841/zataxajavowoluxini.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xisefowu/cheapest_tecno_android_phones_in_nigeria.pdf
    • https://s3.amazonaws.com/zoxewudunigus/bible_genealogy_timeline.pdf
    • https://s3.amazonaws.com/sugosubexez/41501874856.pdf
    • https://uploads.strikinglycdn.com/files/6c9602d4-e6c0-4a79-8b08-92304229c893/97735005027.pdf
    • https://s3.amazonaws.com/mipizaju/connective_tissue_worksheet.pdf
    • https://s3.amazonaws.com/zedilegol/10139075240.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_off0000e683.bin
53091a583c232ef5fa1275510978748a6b62919d3028b9d6ea828d3a9f6ac8da
pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 5948 bytes
font_01_sfnt_off0000face.bin
259e7cea1302b0cfcabb073208093127b64f700532bbaf425aa692bb9272d82a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 10212 bytes