Malicious PDF — malware analysis report

Static analysis result for SHA-256 5442345a8773c913…

MALICIOUS

PDF

109.0 KB Created: 2021-05-14 04:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 07ed3db15214fe6e0fc397e11a1c2005 SHA-1: d9d1189256dbf31769ea94a7d48c34e52c78bd0a SHA-256: 5442345a8773c9131f4056fec6ba0e15fdd39042ee0510852ba66fac1b5bdad7
126 Risk Score

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 0.9988

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://ponafet.ru/strik?utm_term=oxford+dictionary+word+of+the+year+2020+belarusian PDF link annotation
    • http://naturmilans.fun/kururinanumatunu9stf3.pdfIn PDF document text
    • http://komarovskii.xyz/50472669211nuau.pdfIn PDF document text
    • http://nowtorrentz.com/68609428161p6jg2.pdfIn PDF document text
    • http://libertinemodels.com/jakalixejil5874.pdfIn PDF document text
    • http://feyakast.online/which_one_is_worse_a_psychopath_or_sociopath1d03h.pdfIn PDF document text
    • http://trellos.fun/edinburgh_city_centre_bus_mapal3vd.pdfIn PDF document text
    • http://my-credit.info/baburao_bagul_booksd4sh0.pdfIn PDF document text
    • http://sq11mini.com/33528931927w7zdd.pdfIn PDF document text
    • http://bred-enligne.com/mejagepidim2jcgn.pdfIn PDF document text
    • http://salonapp.xyz/kirby_vacuum_service_locations_uko614g.pdfIn PDF document text
    • http://pixxel.life/advanced_functions_trig_identitieskmjhp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/05eac857-f32b-47d3-aa95-7c042af2ca11/19006999419.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/nogasusitorivugevuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/295840d7-214a-4f7e-8de9-2b33d8ad8599/konud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7321f409-2b06-4357-95b4-5f50ae14c997/how_to_change_the_cmos_battery_in_a_dell_inspiron_1525.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/1111535478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd846ea8-496c-440e-80e3-5af3f5405d1c/factors_affect_the_perception_of_pain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb49b8eb-db80-456d-b9c9-e1c02db2bf09/xodixulalapux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a72ca75-b904-41b9-8787-64f048a0738d/xemomipar.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/ado.net_c_tutorial_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/43250755066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10ac073f-3d83-4632-addf-839a3900c9fb/mortal_instruments_books_in_order.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15114 5812 bytes
SHA-256: e3c5cab94894f8f940ba2baec0354e9348c62f0e285618c34e26d338141bf1b0
font_01_sfnt_off000164ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164ED 12608 bytes
SHA-256: 748d916e2e29d0c7e0d31ea63d369338679ab4017d3bb1fb13d27d04dc1a57c0
font_02_sfnt_off00018ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EC0 16544 bytes
SHA-256: c64f975c7c74378765a15e192890ba001b575443647995d4109c17b56814fb1e