Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23bb8231ab86022…

MALICIOUS

PDF

88.1 KB Created: 2021-03-25 16:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 29a1554c336c7e6d8144b1dab61c8a5a SHA-1: 52bfea487b82f32b0002a14752c57e9cdf473a12 SHA-256: c23bb8231ab860226da86f4e0edb7530b4f308eb56782345b7f2b7ced4eed399
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the primary goal is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/123?utm_term=mining+company+profile+samples+pdf PDF link annotation
    • http://love-your-lips.online/88887766553pxerf.pdfIn PDF document text
    • http://tesocoin.online/credit_secrets_by_scott_and_allison7etue.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/h3ib1hh/waste_management_jobs_near_me.pdfIn PDF document text
    • http://repochka.site/how_to_do_origami_step_by_step_for_beginnerseg39y.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/hig5PVw/microsoft_teams_app_for_ios_9._3._5.pdfIn PDF document text
    • http://bodyita.space/11775704221gnpuy.pdfIn PDF document text
    • http://makamar.tech/digital_fundamentals_floyd_11th_edit4uxem.pdfIn PDF document text
    • https://cdn.sqhk.co/milagaleja/gjfLgsL/tonasono.pdfIn PDF document text
    • http://kisagek.22web.org/how_to_become_medical_assistant_in_california.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://s3.amazonaws.com/bitajemisajoz/new_bengali_movies_1080p.pdfIn PDF document text
    • http://rogidisili.rf.gd/ritifapagojupazebowamoki.pdfIn PDF document text
    • http://merexarumok.rf.gd/12908730441.pdfIn PDF document text
    • http://kesajuwigiferu.epizy.com/70570723405.pdfIn PDF document text
    • http://dukizovisepo.rf.gd/47447116611.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/lirik_lagu_bts_answer_love_myself_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/tascam_dp-006_6-track_digital_pocketstudio.pdfIn PDF document text
    • http://majilutiwuxas.rf.gd/synonyms_worksheet_for_grade_1.pdfIn PDF document text
    • http://buketoxepebaf.epizy.com/popuzatezemamebene.pdfIn PDF document text
    • http://gegukisakewomo.rf.gd/rulozusijufexitafukev.pdfIn PDF document text
    • http://kezadovimitaw.rf.gd/42506062299.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/general_knowledge_questions_with_answers_2018.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_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 5292 bytes
SHA-256: e3c60bda4268401ff015b64e311b417cb6259edadc4a6be55f2a44cc703cc155
font_01_sfnt_off00011c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 11396 bytes
SHA-256: 4182e801ae3c44c90a7f89a9e3f09ecd0821ad9238dc38c3b376d7904dfcaed4
font_02_sfnt_off000142e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E5 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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