Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c265c5b4446c6f…

MALICIOUS

PDF

99.0 KB Created: 2021-03-30 00:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fb2124f44f92499ed0d9821a3ea1840d SHA-1: ce16045f91e3f5b1f3a6b249125a202e2025ae39 SHA-256: a8c265c5b4446c6f38f53b5c08e11f0c95bf46d20c08f8777f7936dd91f8cfa7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/123?utm_term=elegant+hotels+group+plc+annual+report+2017 PDF link annotation
    • https://zopokobo.weebly.com/uploads/1/3/1/3/131383813/mudagimevagik-tidugase-fewamu-firarebusomurow.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/kjv_malayalam_bible_free_download.pdfIn PDF document text
    • http://xevijuwidenuxet.mypressonline.com/28218237484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491169/normal_5fda77b8243c4.pdfIn PDF document text
    • http://somubuzesixuwun.getenjoyment.net/binelamanotoniguxu.pdfIn PDF document text
    • https://nalodewemutut.weebly.com/uploads/1/3/1/1/131164475/1150444.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502906/normal_6000903a26645.pdfIn PDF document text
    • https://mekowoto.weebly.com/uploads/1/3/0/7/130738632/porojasivululuroka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489033/normal_600c7551d127c.pdfIn PDF document text
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/14416b9a.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/instrumen_survei_standar_nasional_akreditasi_rumah_sakit.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/tedotivi-nivemo-tabuzasap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421049/normal_5fc9ad754a7a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/nivawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f75f10-143c-4fdb-9399-dd5f26ba27d9/sony_bravia_32_inch_tv_stand_screws.pdfIn PDF document text
    • http://rurebafib.onlinewebshop.net/amparito_roca_saxo_alto.pdfIn PDF document text
    • http://xefiposokupama.myartsonline.com/funexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c2b86de-4c12-4f37-8842-8aed20af965b/46281418948.pdfIn PDF document text
    • http://jozilaro.atwebpages.com/willy_wonka_and_the_chocolate_factory_full_movie_free_english.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/74006635512.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/mary_poppins_umbrella_handle_template.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_off00014488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14488 5560 bytes
SHA-256: 5f3d5e88abf45730c6c88ac8d84dc556c0bb60df4d4b80ba7b6133eaaa9ad579
font_01_sfnt_off0001577f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1577F 11408 bytes
SHA-256: 2f6c711ff70fbed4ad5b18d05fcc766008a79c363f086be6b0d591b06b10076c

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