Malicious PDF — malware analysis report

Static analysis result for SHA-256 e890acd4b5b8c016…

MALICIOUS

PDF

76.0 KB Created: 2021-03-17 16:19:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 99282bf2df409cfb004eca5719d29542 SHA-1: ba009cbf08643f64673b11936f54baed416774cb SHA-256: e890acd4b5b8c0163890f241d774b91cc86bdd0b5559303318922307214361d8
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, with one specifically pointing to 'baarspo.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=appvalley+vip++ios+free PDF link annotation
    • https://cdn.sqhk.co/moturalogupe/gd4ChcQ/quotes_universe_life_everything.pdfIn PDF document text
    • https://cdn.sqhk.co/wizevomorofe/aShglhe/dental_assistant_jobs_in_hospitals_toronto.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/gigc2Ak/39642211136.pdfIn PDF document text
    • https://nasoluludeg.weebly.com/uploads/1/3/4/4/134435301/1397383.pdfIn PDF document text
    • https://cdn.sqhk.co/sozedikepasu/hGjextd/sad_ringtone_2020.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/vuwisaguz.pdfIn PDF document text
    • https://fiwigerisen.weebly.com/uploads/1/3/1/4/131408459/dafanuliwifedof.pdfIn PDF document text
    • https://kevititexozasen.weebly.com/uploads/1/3/2/7/132712545/kufobiwenusufi.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/jfxjiIw/splash_lagoon_hours_sunday.pdfIn PDF document text
    • https://cdn.sqhk.co/jitamoxi/j5721XE/keto_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/fjagdji/hustle_castle_hacks_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekejuf.atwebpages.com/capstone_education_200_puzzle.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_8babca158bb84ba18b33e24d96612b52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc5befd-8322-4c46-86ca-759472afa82d/how_to_connect_bluetooth_to_jvc_kd_r320.pdfIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_aaaab754ca894625b8375856f4d1dde2.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_57655016caf44386886e6e9038374d90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0485b84f-1f5c-4a84-9278-a60a2050f245/how_to_upload_files_to_wix_website.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_f72d47e6efbc4b62b5f216855672e566.pdf?index=trueIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_4883e331c2e34e8fad93d70ec0c43373.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36002de8-62ee-4dcc-9843-7b40106dfcb3/how_to_play_which_will_nick_drake.pdfIn PDF document text
    • http://mifofoxidil.onlinewebshop.net/free_audio_books_vc_andrews.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_off0000ec5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 5048 bytes
SHA-256: 86610ce5a440e7a8576a7deeae151b0e2635d677adfa962ea81ce7a6752e332c
font_01_sfnt_off0000fda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 10788 bytes
SHA-256: d9f47ccce1084e6968b3a313758d2e9ddf1629ec714baa494211cacb384fab87