Malicious PDF — malware analysis report

Static analysis result for SHA-256 708ab79a7d96b09f…

MALICIOUS

PDF

83.2 KB Created: 2021-04-13 17:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7ddcc454eff785a4f1a6429173010610 SHA-1: 9b6ec89b069e8a0a78c06c3cc0e027ba8b856a90 SHA-256: 708ab79a7d96b09f422c83ead77f1f7e245f4867ea376a371f791a34aa58ed3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=full+motion+tv+wall+mount+55+inch+walmart PDF link annotation
    • https://cdn.sqhk.co/lamifiriluz/ieLyhgw/ielts_reading_answer_sheet_2014.pdfIn PDF document text
    • https://cdn.sqhk.co/vutexexukus/bgjb1h9/hideous_zippleback_class.pdfIn PDF document text
    • http://fikowadem.22web.org/discuss_the_barriers_to_effective_communication.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://instapresent.site/syfy_shark_movie_marathonmil76.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/kgeE9ic/dutake.pdfIn PDF document text
    • https://cdn.sqhk.co/navolakolire/0gjgdjc/audio_recording_app_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/igjfJHc/54102332487.pdfIn PDF document text
    • http://xerijegodufiw.mypressonline.com/dukukojano.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/48040631187.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/fxggvje/96510377534.pdfIn PDF document text
    • https://cdn.sqhk.co/fewesiwe/hbKhbIJ/zomimex.pdfIn PDF document text
    • http://liketsven.xyz/gelurosetobizabkfbhy.pdfIn PDF document text
    • http://uniques.space/28802634210cbzgj.pdfIn PDF document text
    • http://bioforce-co.site/asbestosis_2015lhg3s.pdfIn PDF document text
    • http://sepukolobu.sportsontheweb.net/zajaziguxuwexexipojupopin.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/simple_past_tense_irregular_verbs_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jakukimokop.rf.gd/abetment_in_ipc.pdfIn PDF document text
    • http://wujagenak.atwebpages.com/what_flavors_of_milkshakes_does_sonic_have.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_off0001087d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087D 5092 bytes
SHA-256: f125e74c58b09ad43a8a5365fea25aeba2ead310b54b8d79c1c41e9d94abaf5e
font_01_sfnt_off000119b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 11056 bytes
SHA-256: f8dc91c1020f756bec3c4f21bbaec8d3521b3ab8456b6d36d9e3760f668c7457

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