Malicious PDF — malware analysis report

Static analysis result for SHA-256 831140d07cc42f5a…

MALICIOUS

PDF

84.6 KB Created: 2021-05-18 11:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bcde780152bc5c0d1ae692546a2202be SHA-1: 192bba63ff3f1508fb3d45870142b6e2caf78e38 SHA-256: 831140d07cc42f5a79d5db03115117047ce7e638a5c9ace40b9c5305d0c40353
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 0.9996

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://kuzutuzo.ru/strik?utm_term=athlete+weight+training+program+pdf PDF link annotation
    • https://xusalifur.weebly.com/uploads/1/3/4/1/134131705/3270406.pdfIn PDF document text
    • http://bolagafub.iblogger.org/muzenawegivinamew.pdfIn PDF document text
    • https://jobawanajofuru.weebly.com/uploads/1/3/4/0/134042661/307701021.pdfIn PDF document text
    • http://besudigedabax.iblogger.org/shutterstock_free_er_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489844/normal_5fe16708118b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454561/normal_606e6ccd6c614.pdfIn PDF document text
    • http://nazomomomujo.iblogger.org/what_causes_furnace_to_shut_off.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gazunobopa.epizy.com/best_free_gym_workout_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/33564458894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5149b0-5a69-4896-b536-0ff8a3686e08/air_force_one_movie_online_youtube.pdfIn PDF document text
    • http://bajepigulakosiw.epizy.com/27595749129.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/64556833670.pdfIn PDF document text
    • http://tobavukopipe.epizy.com/30700775601.pdfIn PDF document text
    • http://rezujadutifinom.rf.gd/47240560214.pdfIn PDF document text
    • http://wivoruremuwun.rf.gd/jujipinefelazo.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/58168754494.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/9750731993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f26cfe60-4638-4232-8d41-4b23469fc73b/rokikume.pdfIn PDF document text
    • http://bidogoko.rf.gd/xezebawe.pdfIn PDF document text
    • http://tubiruk.epizy.com/49591715282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/254bf0ea-0167-4296-a8f4-8290be018f09/pasos_para_la_administracion_de_medicamentos_por_via_subcutanea.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_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 5360 bytes
SHA-256: 48f8cb9a8ff540edecb247221ba10d8eb25380a70143863c5c75b7600d24144c
font_01_sfnt_off00011ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECC 11120 bytes
SHA-256: aafce97ecdb4347edcd36c29886912dcc246bfd802d624d2c55744d08375c99f

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