Malicious PDF — malware analysis report

Static analysis result for SHA-256 7948c3f849a1104a…

MALICIOUS

PDF

76.4 KB Created: 2021-03-14 13:29:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: aa56791230e743797c829b95aff8e9bc SHA-1: 210a36a46b7176daa54eb40ae5aa0b5494655145 SHA-256: 7948c3f849a1104a2771bb757b4f91a7fbb465877e3c44bcf3244daa42bdfbf2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous external links, suggesting it functions as a link farm or phishing lure. The primary URL observed is https://baarspo.ru/award?keyword=evermotion+archmodels+48+pdf, which is likely part of a campaign to drive traffic or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://baarspo.ru/award?keyword=evermotion+archmodels+48+pdf PDF link annotation
    • https://cdn.sqhk.co/jujifefa/Rjc6igK/canavalia_ensiformis_para_consumo_humano.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/applied_behavior_analysis_for_autism.pdfIn PDF document text
    • http://midesamipazizuj.scienceontheweb.net/ielts_academic_reading_practice_test_4_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/zotiperugi/ygj8jjQ/talking_tom_cat_game_free_download.pdfIn PDF document text
    • http://tuvivukaroj.mygamesonline.org/counselling_adolescent_problems.pdfIn PDF document text
    • http://jaxifas.getenjoyment.net/nixon_regulus_replacement_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/vetedaxuzele/cCghmjh/best_t-_mobile_phones_for_seniors.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/KKghNih/77270265701.pdfIn PDF document text
    • http://jaxifas.getenjoyment.net/zumekixu.pdfIn PDF document text
    • http://xexejevun.medianewsonline.com/compound_adjectives_exercises_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/bisulalu/wwheNkz/fun_facts_about_space_junk.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/edF6igb/vakupilujutulag.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/20478687716.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/basketball_plays_for_middle_school_against_zone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_eddad7001fbd4ac3ba904c983c543eb5.pdf?index=trueIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_909c76fac9ce4ad1894148c6ff26fb12.pdf?index=trueIn PDF document text
    • http://xakazasaravi.onlinewebshop.net/70612205290.pdfIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_471cd945b77a408dae2a658c735e6a41.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_2959240f7d494b5cb32dd2aa73a203a3.pdf?index=trueIn PDF document text
    • http://satawakerexe.atwebpages.com/autotable_jspdf_font.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_off0000e7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BA 5692 bytes
SHA-256: a3caf5b6cbd42e1bdf1eb909c2d55c474501bc214d43a00e784e088298e6b458
font_01_sfnt_off0000fb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 12708 bytes
SHA-256: a5c8906e0ff8dd994fa5127147d493b32d1a48c6dc2387c1ef93bee3972fe2db

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