Malicious PDF — malware analysis report

Static analysis result for SHA-256 be442d755e91fd8b…

MALICIOUS

PDF

66.1 KB Created: 2021-02-10 18:06:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6c8a80ff1416b8a5516f5154d386c423 SHA-1: cb53563de284c499e01bcb5bc0632e9a51c9edfb SHA-256: be442d755e91fd8b6bd569ea2fe795af4c7d5e01b3969058cd87f9213b60b7c8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/aws?utm_term=nice+guideline+alemtuzumab+ms PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5ff184aa5ed6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383137/normal_5fc6c8c6574d4.pdfIn PDF document text
    • https://tipirigemiwar.weebly.com/uploads/1/3/4/0/134016889/nedilunukufude_guvilir_vusasebu_bogadepik.pdfIn PDF document text
    • http://nimidarizul.22web.org/oxford_chemistry_textbook_answers.pdfIn PDF document text
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/vepafe.pdfIn PDF document text
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/nezavuveja-modagaka.pdfIn PDF document text
    • https://lugilalosu.weebly.com/uploads/1/3/4/3/134314137/wewavovowijusibi.pdfIn PDF document text
    • https://nigupisotaku.weebly.com/uploads/1/3/4/3/134374455/kufelu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403685/normal_5ffbf2a5b8259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426421/normal_60185c184bf40.pdfIn PDF document text
    • http://dulexip.22web.org/94367643199.pdfIn PDF document text
    • https://bujozimadepaxed.weebly.com/uploads/1/3/4/6/134615651/369816a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zagebixomibolo.rf.gd/nurukekunalujokunuw.pdfIn PDF document text
    • http://zonadomafi.rf.gd/commandos_2_game_full_version_free.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_off0000c4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D5 5320 bytes
SHA-256: 598770c8556c00fcb11b0b55e047919fd5bc4442e5be59ac14743b6ac5544d1c
font_01_sfnt_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 10836 bytes
SHA-256: 70402884ce6462ce37dad144791705dd7e5e1f5d1d3f2a760c0b97f47b2f546d

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