Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e56f4f7bad532fc…

MALICIOUS

PDF

74.7 KB Created: 2021-02-12 15:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9a21555dbd5f800e21dd70d96243e440 SHA-1: 10f7b0748c2bd3273f86c5948ec5eac9006ce7e1 SHA-256: 2e56f4f7bad532fc312dc010fcaa4d521f8eef6f073a3658cf130b0f3866d33e
186 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 detection for a link farm and a high confidence ML classification. The document contains numerous external links, many hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript, though obfuscated, indicates an attempt to execute malicious code, likely to redirect users to malicious sites or download further payloads.

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://baarspo.ru/123?utm_term=coney+island+hospital+maintenance+jobs PDF link annotation
    • https://vawuzusafut.weebly.com/uploads/1/3/4/8/134863851/wukugi-rokevemawawi-foguwejikow.pdfIn PDF document text
    • https://zavowajasobi.weebly.com/uploads/1/3/1/4/131406950/005598a4b2.pdfIn PDF document text
    • https://tovejuzu.weebly.com/uploads/1/3/5/3/135398771/5440964.pdfIn PDF document text
    • https://nenejiremox.weebly.com/uploads/1/3/0/9/130969141/9328277.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/ChdQFid/fepapakerek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462697/normal_6017401a69eda.pdfIn PDF document text
    • https://riwinimogo.weebly.com/uploads/1/3/0/9/130969841/4287127.pdfIn PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/dolez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472766/normal_5fe60f4139d6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414153/normal_6008c68c7e660.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/zaxagi-xevarafokofafus-bigonozuwifava-bobalijan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5ff3f69ad36a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459175/normal_5fe0464929956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387929/normal_60264471d21b5.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/jufowokedunod/82049269033.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/jboss_application_server_interview_questions_and_answers.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_off0000e6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 5440 bytes
SHA-256: 2e1c6fa4c31abb631a745441bb8c64499767c0a74ae9ee6d539dd008380ffcc1
font_01_sfnt_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 10624 bytes
SHA-256: b26af3a211b90ec6e501c85a7eb37ebb48586f6d9c55f4cd052efca8df54567b

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