Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c79aef727630162…

MALICIOUS

PDF

79.9 KB Created: 2021-05-23 06:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: dba0bb6fbb6bd91c3044e185a009f5b5 SHA-1: d6eb85814cbc087590b4a69c123559c73c206b93 SHA-256: 2c79aef7276301620cbf71621bd062b89318fcfb8283b39edd1d0fb3b28ea218
222 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious redirectors or link farms, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The document body, though heavily obfuscated, contains a search query that attempts to disguise the malicious intent. The ML classifier and ClamAV detection strongly suggest malicious content, likely phishing or a downloader.

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
  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/strik?utm_term=best+passport+size+photo+studio+near+me In PDF document text
    • https://cdn-cms.f-static.net/uploads/4486534/normal_6037575e7b32e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_601044294e7c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415935/normal_5fd7a8dfa7226.pdfIn PDF document text
    • https://jawimuxuketeg.weebly.com/uploads/1/3/4/7/134763527/laxotijubivi.pdfIn PDF document text
    • https://xanerenidijuv.weebly.com/uploads/1/3/0/7/130739333/xejatu.pdfIn PDF document text
    • https://fuxarudoniw.weebly.com/uploads/1/3/5/3/135350341/kajexaridafuvetukex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486971/normal_5fdee871cddf3.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/serogajugomiji/intex_pool_filter_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63b56b8b-67b5-41e7-803e-9b55f0ada5c1/35646809610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d724df-8cb9-4634-a6a1-dae78574ccb5/69500272992.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/pisamemavusoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91f08cd0-daf6-4888-bfb5-8ceee5c7dc8a/dupigomivotuvuk.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/vivitar_bluetooth_speaker_with_voice_assistant_target.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93216ef8-ae0a-434b-a1b8-7af13ca6bf6e/25424443594.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/gajotawakukopazazowigana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be6ea7a1-65f7-4236-8e0b-66dd7cfd569f/43213652728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1acb23f8-d571-47a1-b090-30b6ce2d8eb5/12589815583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c1f40b2-3e48-405a-8ff8-a2a5ca8c907a/what_are_the_differences_between_the_house_and_senate.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/breakfast_on_pluto_soundtracks_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_off0000fc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC54 5268 bytes
SHA-256: 31c01e458e3748d00fa1db3c8b32f81837305bbbbe3a74725d5372048549efe0
font_01_sfnt_off00010e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E16 10460 bytes
SHA-256: 750bc2f82e5b70203659ace3645fb6528ae0164284cc4ea99be8721c591fa3d8

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