Malicious PDF — malware analysis report

Static analysis result for SHA-256 590bb974dd0e7bd5…

MALICIOUS

PDF

74.7 KB Created: 2021-01-26 11:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 86751ff3d2a283bcd93a5a4ce9c077a9 SHA-1: ef426b04ef8f61b37cbff28d40552ef120ad8260 SHA-256: 590bb974dd0e7bd5099ab7578d1ff05eb2b463f119fa0f00f946e5711415ac99
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or phishing. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of links pointing to potentially disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to directing users to malicious sites or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://maypoin.ru/aws?utm_term=goalkeepers+report+2017 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409840/normal_5fd9b6912992d.pdfIn PDF document text
    • https://duvokazi.weebly.com/uploads/1/3/4/1/134108747/dibinogaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388825/normal_5fee681663b32.pdfIn PDF document text
    • https://cdn.sqhk.co/naxiwakiwuv/ChcHEBN/23725972228.pdfIn PDF document text
    • https://nufawufaza.weebly.com/uploads/1/3/0/7/130740177/972bbdd5d8.pdfIn PDF document text
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/roxarobotijavesoboxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5fe82e4aa209a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426262/normal_5ff170bf52792.pdfIn PDF document text
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/adf0c030f.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/gckjaie/punch_boxing_warrior_ninja_kung_fu_fighting_game.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/ggUiejh/vexed_cast_season_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368759/normal_60097cb71447b.pdfIn PDF document text
    • https://cdn.sqhk.co/xivumatozo/fhahfia/cross_cartoon_drawing.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/samipu_pimemofezufo.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/hciccij/one_punch_man_season_2_release_date_crunchyroll.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/jenagubadopi/xuzupimuta.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/couple_of_days_nigerian_full_movie.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 5316 bytes
SHA-256: 18c00d1613ebfe68ca9b5a58d53ffc27ab3d8c68e3eefdaf8a6b371c2998eb38
font_01_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 11552 bytes
SHA-256: 68077c921fc1cc1de5d22b7b36e5bbe4e2470b37e591a450b2f3479e109509f4

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