Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a133a666f218e36…

MALICIOUS

PDF

79.9 KB Created: 2021-03-04 22:17:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 200cef864bee31edaef0cde6a3d40891 SHA-1: 77b5d69851be6745241e131a8c98e6b5b953d774 SHA-256: 2a133a666f218e36f4c63163eef975554eaacb6438b07e476094eae84954e96b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a link farm, with one URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The document body is heavily obfuscated and appears to be junk data, offering no direct clues to the specific lure.

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://nipisod.ru/123?utm_term=boy+in+the+striped+pajamas+movie+plot PDF link annotation
    • https://cdn.sqhk.co/jiguluzufuwa/heKbYTP/2020_election_dates_california.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416802/normal_5fdd7e474ab83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413011/normal_5fc71b0fda585.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/VYzh4jd/livurikipoga.pdfIn PDF document text
    • http://nepufikusugepa.iblogger.org/seoul_semiconductor_annual_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/11b66376-728e-4a17-9ffa-ce770fae317c/58777794822.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/apqp_second_edition_manual.pdfIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_29c4d0e81af04bc0b4e0320f92b8c9c4.pdf?index=trueIn PDF document text
    • http://kofupugixujodin.epizy.com/aaru_movie_songs_telugu_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b2199e-accc-461e-90d1-650b8dbd7351/45993982330.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/ladosuxewotefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/651078fe-b566-40b2-8a3c-af87f1238021/revokowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b89b8288-6a4d-45a1-b96e-bd5f37c3b278/what_are_the_specific_advantages_of_database_management_system_over_traditional_file_processing.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_0f7bcbf9d68e41f6aa81f7f8d67b15d4.pdf?index=trueIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_8dfeab26a2ed4a21a6a351e3b22df5ca.pdf?index=trueIn PDF document text
    • http://momesesewoja.rf.gd/globo_play_globo_reporter_ontem.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_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 5484 bytes
SHA-256: 0644af100a4e4fcb358ee793b6852220cbbf84880d3ba9c580e3ec221f9cf6d5
font_01_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 11472 bytes
SHA-256: a3d425402d2060f103ee590fd591a2d30ccdb31a573efac695249ed98a6752cd

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