Malicious PDF — malware analysis report

Static analysis result for SHA-256 b632b7a45d3c8632…

MALICIOUS

PDF

90.8 KB Created: 2021-04-12 10:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3935c86571ba2cd803d542da2589d6e5 SHA-1: de6bbc5dc673661db24572ff71d12f5d5e685c22 SHA-256: b632b7a45d3c86328182bbbeb365cf5bcbf6abae66ed15e869d13dc6d57d5da1
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominently featured in the document body as a 'Dell precision 390 memory upgrade' lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, and ClamAV detection confirms this file is malicious. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

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://jottigo.ru/strik?utm_term=dell+precision+390+memory+upgrade PDF link annotation
    • https://leliwigozamik.weebly.com/uploads/1/3/0/7/130738568/tefoz.pdfIn PDF document text
    • http://bizbize-yeteriz.org/ricettario_bimby_gratisejp97.pdfIn PDF document text
    • http://strongcreditscore.info/1206913164196idt.pdfIn PDF document text
    • http://tugofexofuwaza.22web.org/acog_cervical_cancer_screening_guidelines.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/ssc_nic_in_result_2020_gd_download.pdfIn PDF document text
    • https://tajaleder.weebly.com/uploads/1/3/5/3/135320318/1246423.pdfIn PDF document text
    • http://siankaanmexico.com/anime_characters_birthdays_on_january_219d9ml.pdfIn PDF document text
    • http://taxokisekajetek.22web.org/dilawejopelanipikuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mozabufapimil.epizy.com/boxanojisuvinibebola.pdfIn PDF document text
    • http://lanelubeberasi.rf.gd/spotify_premium_apk_cracked_iphone.pdfIn PDF document text
    • http://mafefelanepule.epizy.com/87461933580.pdfIn PDF document text
    • http://tuzivapevof.epizy.com/nomenclature_worksheet_6_binary_covalent_compounds_answers.pdfIn PDF document text
    • http://tazisurabitej.epizy.com/pdf._js_angular_2_example.pdfIn PDF document text
    • http://tidewoxawutose.epizy.com/ireport_5._6._0.pdfIn PDF document text
    • http://fetapewifug.epizy.com/citra_android_pokemon_y.pdfIn PDF document text
    • http://woxikajir.myartsonline.com/atar_notes_legal_studies.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_off000123ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 5956 bytes
SHA-256: 62e370f37c3db95177a721213f73c2867626abbda5020805fb2d9936053f3d64
font_01_sfnt_off0001381f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381F 10984 bytes
SHA-256: 7973166430f32c83b8f6760fc865afc8dbda13a7dfb628bc8432dda68a233878

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