Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b2cf7e84a1404f…

MALICIOUS

PDF

73.9 KB Created: 2021-02-27 05:36:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 116a859cca1066ede9320e7ee7df4fb5 SHA-1: 4687ce47cfcc9ad79b41a3dc82a6126322af1509 SHA-256: a7b2cf7e84a1404fb03046327cf66ab67af302019ac063cba8cb7b3fbb76a7ce
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or malware downloads. The document body, though heavily obfuscated, appears to contain keywords related to game mods, suggesting a lure to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://jottigo.ru/strik?utm_term=fallout+4+pc+mods+on+ps4+tutorial PDF link annotation
    • https://sesifubonimexa.weebly.com/uploads/1/3/5/3/135317238/8860723.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423145/normal_5fc6a397a4af6.pdfIn PDF document text
    • https://dodonixufaf.weebly.com/uploads/1/3/1/4/131453867/loporalikiveroxenuma.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/jjbmjgh/60750813104.pdfIn PDF document text
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/8323110.pdfIn PDF document text
    • https://mipurilor.weebly.com/uploads/1/3/1/0/131071035/bafiniweforur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407576/normal_5ff28cd80d983.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/crieiXY/25116284720.pdfIn PDF document text
    • http://girameluxo.iblogger.org/domamobamosu.pdfIn PDF document text
    • https://lawuzifelive.weebly.com/uploads/1/3/4/0/134041442/nimijojux_zekiwobut.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/igo4zOr/69314441567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444853/normal_5fd9e59c9c0b5.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/Njjhge2/minecraft_world_downloader_mod_1._16._3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lezerawe/bowling_score_sheet_template.pdfIn 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_off0000e4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 5260 bytes
SHA-256: 767a19c0770c5e369ba5011639f4a57212cba9b91a61c98f408e3fbe0ddf91ee
font_01_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 10472 bytes
SHA-256: 2086ba75b578e75f2ce2e83cec9630bb380327946269363f6fc5d8fe4362508b

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