Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef64763a36f29104…

MALICIOUS

PDF

78.2 KB Created: 2021-02-12 17:00:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c633d164947c17d6b091f0bdd1713dfd SHA-1: 985c3283d5290cf9e4bd86ec1606a3e810b16660 SHA-256: ef64763a36f29104664a7e5b1b693436c5363511564187603319b6621df986f4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or phish for information. The embedded URL 'https://baarspo.ru/wix?keyword=leyes+de+mendel+ejercicios' further supports this, directing users to a potentially malicious site under the guise of educational exercises.

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://baarspo.ru/wix?keyword=leyes+de+mendel+ejercicios PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419847/normal_5ff862e42de9a.pdfIn PDF document text
    • https://pasetesosetoje.weebly.com/uploads/1/3/0/7/130775590/mipirozu.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/yvifggf/awe_psx_emulator_apkpure._com.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/iihccPe/45851856313.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/aiffA5h/app_that_can_download_music_with_lyrics.pdfIn PDF document text
    • http://003-center.ru/77872497297i3ioo.pdfIn PDF document text
    • http://arendagg.xyz/68997088008gysy1.pdfIn PDF document text
    • https://cdn.sqhk.co/ramowejub/Piigjgi/royal_farms_near_me_hours.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446036/normal_5fd0fdd90b749.pdfIn PDF document text
    • https://wugarusuxota.weebly.com/uploads/1/3/0/8/130814120/ronoretofosof-salawixaxiweko-rikigajemaka-jusanigobidu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_5fe6468860522.pdfIn PDF document text
    • https://cdn.sqhk.co/gojapawareke/kje0ige/90945026133.pdfIn PDF document text
    • http://connexion-amelii.xyz/29208853589so1k0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5fcbf6b13e7f0.pdfIn PDF document text
    • http://fdvsefwfrw.space/98629068206iyh10.pdfIn PDF document text
    • https://mofalapew.weebly.com/uploads/1/3/4/3/134307760/tunubegiji-zivoxupiz.pdfIn PDF document text
    • http://persequen.com/bafonotike1hugb.pdfIn PDF document text
    • http://eeeeeyyy.space/young_freedman_university_physics_13th_edition532oc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 4700 bytes
SHA-256: 44ce12ce2dd2f8d6c171b9ff7ffdbbe751b2711ddd05396307a4631901f55f92
font_01_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 11432 bytes
SHA-256: 3f4429efea7c4a73c520a03590cca27e3d99af4eb8bd72b0db81ac9042097ecb
font_02_sfnt_off00011c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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