Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ef901fe8321e47…

MALICIOUS

PDF

78.4 KB Created: 2021-02-03 02:29:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3b48aa5e20cb2861c78628389dbf8242 SHA-1: ba3dbed006e6d3d9896cc3fc2459e80a9e6dc1e9 SHA-256: 11ef901fe8321e4741fb73c747a503123a9f63667f438a403dbda325ade60edb
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The embedded content, though heavily obfuscated, appears to be a lure for movie downloads, which is a common tactic for phishing or malware distribution. The numerous extracted URLs, many hosted on disposable domains, further support the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/aws?utm_term=bahubali+2+tamil+movie+online In PDF document text
    • https://static.s123-cdn-static.com/uploads/4457008/normal_5fd08e0d7e1f7.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/5502165.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459628/normal_5fcaa2008832e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479718/normal_5fd31ab20443d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5fd6593d5bac7.pdfIn PDF document text
    • http://medway24.com/police_reportz3c4e.pdfIn PDF document text
    • http://zawoxilejaku.66ghz.com/72273738169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478687/normal_6010583162889.pdfIn PDF document text
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/rixuw.pdfIn PDF document text
    • https://foziwumiwogesis.weebly.com/uploads/1/3/5/3/135321673/a90326a3cbf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497109/normal_6019de5739aa7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5ff6555858e9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422918/normal_60069bed32722.pdfIn PDF document text
    • http://luminar3-download.xyz/cursed_armor_walkthrough_guide3mxhe.pdfIn PDF document text
    • http://dnepr24.info/blackbird_sheet_music_flutec4imu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407733/normal_5fc876fbc9112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5fd89d4c13290.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/merizar-nufevevizesi-faxewakezilop-lelubamosi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 5032 bytes
SHA-256: 3c08f117eec178992b4537c2242173accbd92c58c496fd5ea9bd3fa626821de9
font_01_sfnt_off0001088a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088A 10580 bytes
SHA-256: de3c2f1f2c9a531c24cfb4f2f72f7119e4363e5239d568bc9b67e084d9ff32ef

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