Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a8e4460f91b8ff…

MALICIOUS

PDF

78.8 KB Created: 2021-02-20 03:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c6d3bf180ba2c909b148176d53f38960 SHA-1: 9621f9a2444bc75707a63303d79543a8d2c3c024 SHA-256: 57a8e4460f91b8ff02544bec99b6f180607a1bc8251304c981ba76ffa65305a0
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/wix?keyword=ffx+sphere+grid+standard+or+expert PDF link annotation
    • http://good-production17.site/unity_create_animation_from_sprite_sheeth09fd.pdfIn PDF document text
    • http://numberoone.xyz/text_bold_android_codewzrts.pdfIn PDF document text
    • http://gikadoketu.iblogger.org/maaveeran_audio_songs_free_in_tamil.pdfIn PDF document text
    • https://xosufovopoxom.weebly.com/uploads/1/3/5/2/135298930/8431c44.pdfIn PDF document text
    • http://apelsins.space/modern_day_plague_sars8a62t.pdfIn PDF document text
    • https://wovegusokab.weebly.com/uploads/1/3/4/8/134850220/253427.pdfIn PDF document text
    • http://pc-remont.website/50_mile_ultra_training_plan1prnk.pdfIn PDF document text
    • http://zigitodaxepugi.22web.org/49999661923.pdfIn PDF document text
    • https://ludefexidox.weebly.com/uploads/1/3/4/3/134344451/6047131.pdfIn PDF document text
    • https://fudolimag.weebly.com/uploads/1/3/4/5/134586879/f0ef5bb3f1f.pdfIn PDF document text
    • http://doordash.link/59655882438mhga7.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/jdgdhjG/jemobo.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/wekibik/bovine_spongiform_encephalopathy_treatment_in_humans.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/tojazagu.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/calibre_ebook_reader_ipad.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 3804 bytes
SHA-256: a03cebe6c99cf2af954f32955720c2d9a2bae2ee8d764947ca9356d13f7d518a
font_01_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 5292 bytes
SHA-256: 30138dede227d8c0c8007b42f75a2becebec7e3f2ff75bbc95ac7c74df3e9991
font_02_sfnt_off000109dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 10368 bytes
SHA-256: a0efaf15fb48f302a000f8af8180051c14aeef29418d14fbdf24e3f58c5826b8

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