Malicious PDF — malware analysis report

Static analysis result for SHA-256 671e0c21e563205e…

MALICIOUS

PDF

77.8 KB Created: 2021-04-29 01:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f59ac48cda59f4045a52da40a82234ef SHA-1: a62575dc5de930bd0146f50925861e724f480876 SHA-256: 671e0c21e563205e0e9954431d029ebc3780e572c2a2f974754ac42dbc0bdc17
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL with a 'utm_term' parameter strongly suggest a lure to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, reinforcing the assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://resalured.ru/strik?utm_term=does+t+mobile+magenta+have+unlimited+hotspot PDF link annotation
    • https://lafadulow.weebly.com/uploads/1/3/4/5/134591129/putikeburigojejifis.pdfIn PDF document text
    • https://saxisonowe.weebly.com/uploads/1/3/4/5/134508075/nujafipilenevu.pdfIn PDF document text
    • http://twoup-viktoria.online/aus_tv_guide_waj9i3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389106/normal_5fce2da13cdfb.pdfIn PDF document text
    • http://busibear.com/is_cbt_helpful_for_ocd0n4u5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365607/normal_60001607b9163.pdfIn PDF document text
    • http://wordsidepost.top/to_be_fine_synonymp2jzb.pdfIn PDF document text
    • https://wopufibirebosaw.weebly.com/uploads/1/3/4/4/134466277/5aaa69896c47500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_6064adac1a393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465010/normal_6048db6a9e951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_600ba8acaa299.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/zuwebawugasujutidjpel1.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/wexoteluwag/uber_sustainability_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7dec20c-1783-4273-a99c-a12e1f48740a/how_to_use_frosting_tips_on_cupcakes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa72936-afe4-4943-bfd0-50673417acec/robidalosisasakufiro.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/2620558686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ea1ba4-778c-439b-948a-41c324027f4c/retiforazibotezen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/797f1738-54ab-4900-93fe-b21fa410a0b2/42427398991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85dcc482-ab96-486c-b9d6-5cd93fa024b1/didudij.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_off0000f1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 5476 bytes
SHA-256: fa71eecfe1032c468cdded5979474e70cd4a05c0e6ea2565079b4c85c391662e
font_01_sfnt_off00010440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 10948 bytes
SHA-256: 16970eec327fab9d01100ff016c650ccabae8e56048b2ba7d41544caaef27659

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