Malicious PDF — malware analysis report

Static analysis result for SHA-256 03146d3d2e892818…

MALICIOUS

PDF

76.0 KB Created: 2021-01-15 14:54:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5af0cb2d986096069d58c652377caa36 SHA-1: be39f1693e0203258d7c30482868151f808f458b SHA-256: 03146d3d2e892818a80ab4b994edfe5c84c89436d7ec09bd12eadd8ea3c0fe83
214 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic search results for game downloads, directing users to malicious redirectors. The presence of numerous external links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely involving redirection to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ggtraff.ru/wb?keyword=war%20chess%20game%20download%20for%20windows%2010 In PDF document text
    • https://cdn.sqhk.co/ruwonumatag/ecBjdup/round_dining_room_table_sets_for_8.pdfIn PDF document text
    • https://rebeluzibefu.weebly.com/uploads/1/3/4/6/134619862/76a7bc51d53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_5f8aa96295b6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498868/normal_5fbe8e7e39bac.pdfIn PDF document text
    • https://daxusakisawepan.weebly.com/uploads/1/3/4/5/134527958/2d9c908e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469128/normal_5fa4aec559169.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/nalifij/tupeluwulinatu.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/61696625719.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/rolejumuserixagosevikitu.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/nba_youngboy_concert_2020_baton_rouge.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_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 5732 bytes
SHA-256: 80ce0eec97d1e600ed4ab8e12b6fbd34584ffbf1d4d430b0f45d7e1c5d0f35b6
font_01_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 11184 bytes
SHA-256: 459e7e0395d5d42919032e31b42c7298b95ef39fddc4c98f355162206b6a095b

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