Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f5b55716b084ec…

MALICIOUS

PDF

84.5 KB Created: 2021-02-25 19:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8315f984cb2b52ed6a83fcf38f2bb297 SHA-1: c51cecf5ca2dc0f4cadae335b1e9a4600d853853 SHA-256: b6f5b55716b084ecd2ed314346e0a08d63aa4504c72323b096cb8f123330cf06
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm heuristic points to the document's primary function as a gateway to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://baarspo.ru/123?utm_term=planet+fitness+head+office+south+africa+contact+number PDF link annotation
    • http://gavefunene.22web.org/sifarivixomu.pdfIn PDF document text
    • http://golixudib.mypressonline.com/beseler_23c_ii.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_601b6f32afb37.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/my_smoke_detector_keeps_beeping_three_times.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/saheeh_international_quran_arabic_text_and_english_translation.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/parental_authority_questionnaire__revised_paq-r.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/iihjbia/tirifikosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499972/normal_600b5bb68f396.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/ntOAieK/flying_dragon_simulator_2016.pdfIn PDF document text
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/9773324.pdfIn PDF document text
    • https://kinotadi.weebly.com/uploads/1/3/1/6/131606109/9822449.pdfIn PDF document text
    • http://vepekideku.iblogger.org/27783306966.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/voxejiroru.pdfIn PDF document text
    • http://barivelovone.22web.org/ain_t_no_sunshine_lyrics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422135/normal_5fef34e6f398a.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/jjhLJii/ant_simulator_3d_full_mod_apk.pdfIn PDF document text
    • https://lowezikalazana.weebly.com/uploads/1/3/0/9/130969016/xigen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485321/normal_60241e6910684.pdfIn PDF document text
    • https://waxutawuvesi.weebly.com/uploads/1/3/1/4/131455398/493774.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/jjYzB5S/39089730730.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rofiratak.rf.gd/matrix_math.pdfIn PDF document text
    • http://fefomopopokelo.epizy.com/galajukazelogife.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/open_source_music_appreciation_textbook.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_off00010c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C98 5404 bytes
SHA-256: 138517122b9d5c13518c3c869dc35661a386373f70bffe03e31bf50f15a81edf
font_01_sfnt_off00011ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 10876 bytes
SHA-256: 07504cbecb8dffd047458e78a5b9d2e47df5228c6eb575e86efa28db48ef1c7d

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