Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75cff3507176a9d…

MALICIOUS

PDF

91.9 KB Created: 2021-03-14 07:44:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 72ea33cc01b17bc466a508141ce6cb4a SHA-1: 2e1616c638b7b15be08f6d30d44fdb04d6cc5836 SHA-256: a75cff3507176a9d05c4a0f7786742cae9badd3e1da2ef6bc6d529d4e5a45b54
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=ap+human+geography+unit+4+vocab+with+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393189/normal_602633767f03a.pdfIn PDF document text
    • http://mamajan.space/what_is_the_most_important_role_that_proteins_play_in_living_organisms_on_earthk42ec.pdfIn PDF document text
    • http://zirekafeti.iblogger.org/en_la_ardiente_oscuridad_act_1_summary.pdfIn PDF document text
    • http://mrshadow.net/duxosot0vhx3.pdfIn PDF document text
    • http://all-system7.club/posuxowidafogufuxasunuoiiif.pdfIn PDF document text
    • http://justiciaforjustice.com/12579658723c5ccf.pdfIn PDF document text
    • http://nowtorrentz.com/how_to_program_a_ge_universal_remote_to_a_sceptre_tvuw55c.pdfIn PDF document text
    • https://sugowixo.weebly.com/uploads/1/3/4/5/134588459/tajalureri-zusesu-gofakisinugajo-kenoto.pdfIn PDF document text
    • http://otomail.business/does_covid_19_need_to_be_capitalizedjokq8.pdfIn PDF document text
    • http://parralax.net/5431969588os9fg.pdfIn PDF document text
    • http://bukuminuwakub.mypressonline.com/who_sexiest_man_alive.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488101/normal_5fc751d7d6213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490739/normal_600cf6a527498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458417/normal_603afc9c4618d.pdfIn PDF document text
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/jitamojinasubatom.pdfIn PDF document text
    • http://fuwenosod.iblogger.org/pure_apk_install_portable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501995/normal_602ed73807d03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pixagikaw.epizy.com/amrish_puri_ke_gane.pdfIn PDF document text
    • http://gotenekopibijo.epizy.com/distributors_of_hindustan_unilever_products_list.pdfIn PDF document text
    • http://kofepiropi.onlinewebshop.net/definition_of_advertising.pdfIn PDF document text
    • http://weniboduxinux.epizy.com/40332518136.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 5768 bytes
SHA-256: 75ee2d66facea2585bf5303f48b886e3111e1ed5554f8583639b4b9e1d6b2ebe
font_01_sfnt_off00010afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFD 2556 bytes
SHA-256: 8476c1916bee23a37ef3f966d20ac6405e5e851c8d549c65148c658ce5f5bf51
font_02_sfnt_off000115de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 11292 bytes
SHA-256: 4b0e6865a52aab70cc7876c2c4fb12472810000ca11a5297181b8275903bd17c
font_03_sfnt_off00013c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C58 16116 bytes
SHA-256: 3dae81b76154e7c62b3b0d30507344c78f02ee9172d09a03fe7a9af96af9e849
font_04_sfnt_off00015135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15135 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333