Malicious PDF — malware analysis report

Static analysis result for SHA-256 873b5baaa4a5a2c9…

MALICIOUS

PDF

77.3 KB Created: 2021-04-23 18:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c5295119a9b9b01f61990f7a874af154 SHA-1: 527f8ab3dcd20e5f1f64b359fe27227cb999ff34 SHA-256: 873b5baaa4a5a2c9c182c1ed0091eb940a3a0f4de4fcd3525ca345f486b3803e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to social media interactions, aiming to trick users into clicking malicious links.

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://maypoin.ru/strik?utm_term=que+significa+una+propuesta+de+amistad+en+facebook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384039/normal_6048e93ccead6.pdfIn PDF document text
    • http://jalojewaga.mypressonline.com/wild_animals_information_in_english.pdfIn PDF document text
    • https://lobokepodis.weebly.com/uploads/1/3/1/1/131164506/12146a412d90c14.pdfIn PDF document text
    • http://sekujirimabasas.getenjoyment.net/adobe_acrobat_editor_download_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412159/normal_601f9ede78729.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/asHcCma/cut_the_rope_time_travel_10-_4.pdfIn PDF document text
    • https://gebikatewizej.weebly.com/uploads/1/3/4/3/134311033/gijibu.pdfIn PDF document text
    • https://cdn.sqhk.co/bemoranoz/ejahghj/ear_infection_symptoms_baby_congestion.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/zokilelotatejozafuvotab.pdfIn PDF document text
    • https://cdn.sqhk.co/lerutefo/8tgheje/tai_game_dragon_city_appvn_hack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_6010b2e501bb4.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/10145975596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_60137adc488a4.pdfIn PDF document text
    • https://cdn.sqhk.co/mojuzizimu/cihaWwh/49304678256.pdfIn PDF document text
    • http://xepelewatelaziv.getenjoyment.net/58850844986.pdfIn PDF document text
    • https://cdn.sqhk.co/lewonuvaxu/3hiJeEy/tie_dye_shirts_for_youth.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443588/normal_6058873d11d00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/nordictrack_c2200_review.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/libro_los_generales_de_dios_1_descargar_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/71979143586.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/64051466769.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_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 5708 bytes
SHA-256: 91c9acc65f1f57bd51d4e26ba5dd70f434ac16dcc7c5f560341068b7455134eb
font_01_sfnt_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 12008 bytes
SHA-256: 5ed7acddca162cf88b349f2f85a838ff6cf56412ec296f90047bfcbf2a3c36e3

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