Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbc41bc00d6821f…

MALICIOUS

PDF

80.8 KB Created: 2021-03-22 13:52:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d0e3304973f1c06f363e587a56851463 SHA-1: b6117c1d7d6ade59677fd0f83b2dff7d217b4d46 SHA-256: fdbc41bc00d6821f85106f238dadad0bc1519925514be840adcedf91a2be20a1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The embedded URLs and the document's structure point towards a phishing attempt, likely using a lure related to product information to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=who+makes+roper+refrigerator PDF link annotation
    • http://gizovivomiz.getenjoyment.net/tamijezut.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/persuasive_writing_samples_grade_5.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/ornamental_plants_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_602ee2404d9af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493545/normal_5fdda148be89f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_600ffcc9e2197.pdfIn PDF document text
    • http://lemakomude.sportsontheweb.net/pelaxoxegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5fd1323249b03.pdfIn PDF document text
    • http://boxupoxegetoji.22web.org/apostolic_preaching_of_the_cross.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383805/normal_5fefc31538ca0.pdfIn PDF document text
    • http://lofoporubatul.mygamesonline.org/libro_de_lecturas_primer_grado_primaria.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476783/normal_603e0915ceed7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_60187f8b9fee6.pdfIn PDF document text
    • http://tinubawolu.mywebcommunity.org/fijopilut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387819/normal_60243a5e0ef17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nevejekegasa.epizy.com/varob.pdfIn PDF document text
    • http://woloruvikato.rf.gd/eclipse_java_for_mac_os_x.pdfIn PDF document text
    • http://mafofeguf.epizy.com/anais_nin_little_birds_download.pdfIn PDF document text
    • http://bexexakik.myartsonline.com/pocket_anesthesia_2nd_edition_free.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/21441105144.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_89c7b8d673de423c8b4ca2ef89d883c1.pdf?index=trueIn PDF document text
    • http://wurebosuloxu.myartsonline.com/abdominal_distension_in_neonates.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_e343d0d938f04324a298c8133c47cb27.pdf?index=trueIn PDF document text
    • http://sukowinom.rf.gd/orbit_sprinkler_valve_repair.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_off0000fd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 5360 bytes
SHA-256: 50d0782a919c0691ef62f3715b3bb104a2007d204a0b59f60a02bc69211aef87
font_01_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 10540 bytes
SHA-256: 1e27bb125049a5c9a7bd0e7cb4e30dd0cb2971ac200ff4c2666976bf5c106c57

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