Malicious PDF — malware analysis report

Static analysis result for SHA-256 527086bb9c673959…

MALICIOUS

PDF

71.9 KB Created: 2021-01-15 00:26:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e495f2e785845db1a6dda4f135a55277 SHA-1: eaecc2f639438eacfd8b6f210ba914647b45edef SHA-256: 527086bb9c67395980464058d4f710eb72f2175ebd282543ccc83a28f0a19c2d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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 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.
  • 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://cctraff.ru/123?utm_term=idle+heroes+pc+ios In PDF document text
    • https://site-1176846.mozfiles.com/files/1176846/zizusamiwumom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403680/normal_5ffe8df221e1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377679/normal_5ff512cd1f9da.pdfIn PDF document text
    • https://site-1242269.mozfiles.com/files/1242269/natuzo.pdfIn PDF document text
    • https://site-1218567.mozfiles.com/files/1218567/browser_link_whatsapp_install.pdfIn PDF document text
    • https://site-1178817.mozfiles.com/files/1178817/64157768396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467975/normal_5fbde03404172.pdfIn PDF document text
    • https://site-1245443.mozfiles.com/files/1245443/platform_film_ka_gana_video_song.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/15301def5081c3.pdfIn PDF document text
    • https://site-1177382.mozfiles.com/files/1177382/dj_name_mixer_pro_apk_download.pdfIn PDF document text
    • https://site-1176192.mozfiles.com/files/1176192/xuladuwadapomoxope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469355/normal_5fcc60642808e.pdfIn PDF document text
    • https://site-1182058.mozfiles.com/files/1182058/tickled_teal_skirt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 4888 bytes
SHA-256: 13c05991c4c6bf121ae0e564a6cfd1dbeefdd80c58f444f0d33c7bc050c37802
font_01_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 10476 bytes
SHA-256: 5a7656fa6ff9f03307ac6af7b89ea157035f827fff02d613ccbde26d30fd91c3

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