Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a7e3c91480567f…

MALICIOUS

PDF

79.0 KB Created: 2021-03-10 22:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 086cedd84ad035ce6b8bad7f4e00c871 SHA-1: 5d30a4bfbb1f01e109d5ea9ba768c6ed9d97b62b SHA-256: f4a7e3c91480567f979ce18c5fcb398fa0911b2e53c476e345bec09c9612620e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://botokaw.ru/award?keyword=cognitive+behavioral+therapy+book+pdf PDF link annotation
    • http://tidajipameme.22web.org/the_wave_todd_strasser.pdfIn PDF document text
    • https://wimavebitajiki.weebly.com/uploads/1/3/4/6/134609796/5786592.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/tighaje/gotoduralifipujogebules.pdfIn PDF document text
    • http://storedubai.shop/dawapexuga6v2z3.pdfIn PDF document text
    • https://kikoxelila.weebly.com/uploads/1/3/4/3/134335894/e5055fc32242.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482190/normal_5fdfd64b34069.pdfIn PDF document text
    • http://afracheat9.xyz/malayalam_song_ambalamillathe_aaltharayil_vaazhum0y7nm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447497/normal_602d7b333ab6e.pdfIn PDF document text
    • http://mini-cam2.club/2006_chevy_malibu_repair_manual_downloadl7sgi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415046/normal_5ff880f5d40c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413865/normal_5fde8d1bd3b2e.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/didjjjh/enmarket_bluffton_south_carolina_restaurants_around.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460723/normal_602d005af3ea6.pdfIn PDF document text
    • https://dosemawa.weebly.com/uploads/1/3/5/3/135388865/pigogagenapesabiwir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_6043b2100dd3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_60200348db3f3.pdfIn PDF document text
    • https://bolifalaloken.weebly.com/uploads/1/3/1/4/131438202/desaxanexidiwujawet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xedoruvuseju.rf.gd/99303929366.pdfIn PDF document text
    • http://fopagozijudiri.epizy.com/18562494882.pdfIn PDF document text
    • http://wejelinemadagep.rf.gd/useful_synonyms_for_ielts_band_7_9_free_download.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_off0000f8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 5396 bytes
SHA-256: 2238efa6a0a4318f85a86ab33a475d1fbeae9e376450ced0c446ac041081aeed
font_01_sfnt_off00010b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 10264 bytes
SHA-256: f479d0d98b0db564d1fb89e9553a3c4bf2afe825a97ac2527e360bc4f899df06

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