Malicious PDF — malware analysis report

Static analysis result for SHA-256 f581407ff0ceede2…

MALICIOUS

PDF

79.1 KB Created: 2021-04-01 19:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1ce89cb43ff6f9950940fd7390f3e08 SHA-1: e3ad2b54310f52b7557ede04675193e2306184cb SHA-256: f581407ff0ceede28c04f2605a07ed0f395cb3216ea7b1ca817249f1313fdf05
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/strik?utm_term=amplificador+de+potencia+clase+c
    • http://doxalasi.mywebcommunity.org/boserukinemomuro.pdf
    • https://junezemojevav.weebly.com/uploads/1/3/2/7/132740237/683132f1fffff5.pdf
    • http://good-production17.site/werezudizarirokavukb6rnt.pdf
    • http://vedivux.mygamesonline.org/52595676266.pdf
    • http://paxosij.mygamesonline.org/50210489749.pdf
    • http://betmoy56.com/22216291597sizvy.pdf
    • https://cdn-cms.f-static.net/uploads/4382953/normal_601b0cae2b848.pdf
    • https://nefufepaxesa.weebly.com/uploads/1/3/1/4/131453268/pegeguvabuli_xoxugeriwaze_zonepesu.pdf
    • https://cdn-cms.f-static.net/uploads/4477163/normal_5fd157f83f123.pdf
    • https://cdn-cms.f-static.net/uploads/4445101/normal_605cae107dc99.pdf
    • http://gufutaca6.xyz/aprendizajes_clave_ingles9lqvl.pdf
    • https://polalakenasi.weebly.com/uploads/1/3/0/8/130813885/kiditivajukinaw_rezew_toxek_jedegewipaf.pdf
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/4680735.pdf
    • http://qwertyujg.xyz/new_breast_cancer_staging_guidelines_2018drh1h.pdf
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/4128629.pdf
    • https://cdn-cms.f-static.net/uploads/4370768/normal_5fe8fc846ed94.pdf
    • http://semasinizitowo.medianewsonline.com/burmese_python_care_sheet.pdf
    • https://cdn-cms.f-static.net/uploads/4488581/normal_601c0529d3cbb.pdf
    • http://nogurufegu.mygamesonline.org/wukulufi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muwemivumazulax/2011_chevy_silverado_owners.pdf
    • https://s3.amazonaws.com/xarojapi/12394039864.pdf
    • https://s3.amazonaws.com/lekezaru/sepepimogadinelapotot.pdf
    • http://ketabigumowun.atwebpages.com/walmart_neighborhood_grocery_store_pharmacy.pdf
    • http://zerowegujij.onlinewebshop.net/chronicle_of_a_death_foretold_chapter_5.pdf
    • https://s3.amazonaws.com/futamo/automotive_industry_history.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f586.bin
40e186810ef2d5c26e457db1c5af2eee8c99886348c79567ac13196a98f4a636		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 5288 bytes
font_01_sfnt_off00010770.bin
c0f0ad129b16794bdd080350ffafd7bfb2cbf3c356ffb7786ea1547b6ab73e48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 11572 bytes

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