Malicious PDF — malware analysis report

Static analysis result for SHA-256 98df7a4c205e6879…

MALICIOUS

PDF

82.5 KB Created: 2021-03-22 12:59:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 08617d6a5c69ab78fbc99a90cc3caf82 SHA-1: 135ef332020ff84467feb90d6bbe068068a89fe9 SHA-256: 98df7a4c205e6879bf6490330315721b791a07e55eec0a2fd1cbfc02b052a043
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://bologen.ru/strik?utm_term=how+to+lose+weight+on+a+vegetarian+keto+diet PDF link annotation
    • https://vejotawugupexo.weebly.com/uploads/1/3/4/7/134756202/5572160.pdfIn PDF document text
    • https://purotuduveb.weebly.com/uploads/1/3/0/7/130738796/55850db346736.pdfIn PDF document text
    • http://bathforlegs.xyz/transport_phenomena_in_biological_systems_truskeyde7ql.pdfIn PDF document text
    • https://jugevenow.weebly.com/uploads/1/3/4/7/134736768/jonoriferiserep.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/fufopikifude.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/12148da5af819.pdfIn PDF document text
    • https://joripipebepif.weebly.com/uploads/1/3/4/1/134131856/6669717.pdfIn PDF document text
    • http://itverys.space/intro_to_clinical_psychology_exam_2_answer_keyh2hh2.pdfIn PDF document text
    • https://nuruvubapifak.weebly.com/uploads/1/3/1/4/131452890/840456f1a29.pdfIn PDF document text
    • http://erogan24.website/fexovuvoxovigug1odc3.pdfIn PDF document text
    • http://freedate18.xyz/how_do_i_change_the_time_zone_on_my_samsung_smart_tvpxjv3.pdfIn PDF document text
    • https://xapodopuk.weebly.com/uploads/1/3/1/8/131856257/f9ba9e2eee10.pdfIn PDF document text
    • https://xesanojazal.weebly.com/uploads/1/3/0/9/130968931/sobabex_notagutituda_welodovo.pdfIn PDF document text
    • https://jonozexogu.weebly.com/uploads/1/3/4/3/134357932/7443103.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/fibipek.pdfIn PDF document text
    • https://begiruxuvasepi.weebly.com/uploads/1/3/5/3/135351124/tulosojoxulanavofas.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
    • https://uploads.strikinglycdn.com/files/8cd7deb7-b311-4a4f-9827-8b03395fdeca/binary_covalent_compounds_worksheet_answer_key_mr_franz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/249c2ff5-45cb-4a9c-99fc-9846722e2bfc/borderlands_2_strategy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9b64d2-7302-4c3d-8d76-338ad63ed658/44919832861.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/timeline_slides_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/zumisubiwogebisatetok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c689fb9-688d-48ed-b6ba-27f5961b3267/67336930305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4fd6f64-8e72-4590-9cdb-cb124ab372c9/52374836938.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/root_call_blocker_pro_apk_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 5052 bytes
SHA-256: 6609fafc410487033549eca78bd3dbe8530f3b6c927bae44fe0d310b44b8080d
font_01_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 10952 bytes
SHA-256: 415c829408460a89c7d8313d94dcde7ff77b06edc72cac757f5f0e3e2601875c
font_02_sfnt_off00012e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E05 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333