Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9c2151ccef3825…

MALICIOUS

PDF

76.0 KB Created: 2021-01-18 20:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3502358f8cbd8848ccf15ddbf7fb7e93 SHA-1: 0a74414c9e75cd6b277d24708fc1a24fc0a47edb SHA-256: 8d9c2151ccef3825a161d833bf0178d5b33147e38bdbd87c71cb7b8d50c0ce14
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The primary function appears to be SEO manipulation or directing users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://yafferge.ru/wb?keyword=cute%20hairstyles%20for%20long%20hair%20for%20work In PDF document text
    • https://kadilawozozupaj.weebly.com/uploads/1/3/0/7/130739633/c733b102.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489050/normal_5fc71e0936423.pdfIn PDF document text
    • https://genamimiwovem.weebly.com/uploads/1/3/1/6/131636881/4033036.pdfIn PDF document text
    • https://nibadaxolakawub.weebly.com/uploads/1/3/4/8/134882114/376667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413240/normal_5ffd75722c75b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426677/normal_5fae0f7bf2042.pdfIn PDF document text
    • https://cdn.sqhk.co/peretudiwi/hi9hgij/wopomopikavavisom.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/ahgjceW/mercury_planet_pictures_real.pdfIn PDF document text
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/7256230.pdfIn PDF document text
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/0894321a4bfd.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/h7Hijge/residual_definition_economics.pdfIn PDF document text
    • https://xasugalepo.weebly.com/uploads/1/3/4/3/134311154/1572a0ffc23.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogivotosu/5kYxheL/74081769552.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/48wjjc0/superhero_robot_premium_hero_fight_offline_rpg.pdfIn PDF document text
    • https://vujipobunovopo.weebly.com/uploads/1/3/5/3/135324227/wubonefegubudogak.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/fedure/rpg_maker_mv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/1609696633.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/carrom_disc_pool_mod_apk_new_version.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_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 5192 bytes
SHA-256: 05fc7565e80ccff4a361b9ef152cbb26247e6443e757b9a84c271397e4b5dd8b
font_01_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 10392 bytes
SHA-256: 2dd1a78e088e6a1f541f72337d17a9a79d2e0e07328369f6a52b5dd2f096d3b5

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