Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca376bb4d77c4ff7…

MALICIOUS

PDF

92.2 KB Created: 2021-03-28 14:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1f81b62ac589c4151dd509a513815544 SHA-1: 8ef1e90331c926fe4dd4fa3439d689d53fd60273 SHA-256: ca376bb4d77c4ff7d135e0996eeb147a7bf7dd394fd2ab07084f37148d0fb266
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. While no scripts were directly extracted, the PDF structure and numerous URLs point towards a malicious distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/123?utm_term=android+google+cast+tutorial PDF link annotation
    • http://xikisavi.scienceontheweb.net/haier_portable_air_conditioner_drain_hose.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/dtGiesg/baby_care_play_mat_foam_floor_gym.pdfIn PDF document text
    • http://jomotew.iblogger.org/wigemojuka.pdfIn PDF document text
    • https://cdn.sqhk.co/fibafape/jhcjcih/85059684520.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/ge_proficy_machine_edition_9.5_manual.pdfIn PDF document text
    • http://zakofuta.66ghz.com/the_rich_are_getting_richer_and_the_poor_are_getting_poorer_song.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/RBiaUge/super_mario_bros_4_game_boy_advance_cheats.pdfIn PDF document text
    • http://laxogapajoze.getenjoyment.net/14877670307.pdfIn PDF document text
    • http://napabedavidok.iblogger.org/zudetote.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nifiwirijapokaf.rf.gd/37214675361.pdfIn PDF document text
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_f144837b43d4401ab451f815cae130a3.pdf?index=trueIn PDF document text
    • http://vorokam.rf.gd/mobesunifupij.pdfIn PDF document text
    • https://e79dab91-b8ca-4f03-a7cf-74564eaa1d8a.filesusr.com/ugd/009cd4_2cacee19d1b746be81f216f6ac6f3ffb.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_16f6fe6c1be14dfba2e03b1fdda8d9ed.pdf?index=trueIn PDF document text
    • http://lexifavigagep.rf.gd/speech_writing_samples_for_students.pdfIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_df2650729a3f4e7d9143a9836b2f3364.pdf?index=trueIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_8e4da1b0d3d5465e84e651a783347dce.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_ce3da5bca71e4a2099f6886693d8f1a0.pdf?index=trueIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_9738fe1e0e24486b951ff32f4c4c0775.pdf?index=trueIn PDF document text
    • http://pimorem.epizy.com/60737453153.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_43c38269c9734959b2093f0da5cc95dc.pdf?index=trueIn 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_off00012aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEA 5096 bytes
SHA-256: e019859833c41caebc4b355a75af8f8a081b5cd2f6470c01644290262db115b5
font_01_sfnt_off00013c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4C 11548 bytes
SHA-256: e3e03642538708692fdc3ff7073a61a9eb27581df40aca4f3734df2c64e27527