Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad27b9bb576a1905…

MALICIOUS

PDF

78.8 KB Created: 2021-04-28 03:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 018c9caff66ecb5e943b11ee6b28a859 SHA-1: 2ea93dc8bea4875394bae92f04718b17cfe21e6f SHA-256: ad27b9bb576a190502f86ff400f5d2c5a3770918c7d72605590b1adf3021a41c
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate the document's purpose is to redirect users to potentially harmful sites.

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://mezovuduw.ru/strik?utm_term=audre+lorde+poem+books PDF link annotation
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/lokerufap_popom_zadoduwexeneros.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/kyibifD/mavaduseritejegaze.pdfIn PDF document text
    • https://xegugunozom.weebly.com/uploads/1/3/1/4/131482992/kowivegedojutixew.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/YWjTiao/perfect_block_puzzle.pdfIn PDF document text
    • http://maxiteguf.medianewsonline.com/injective_surjective_bijective_functions.pdfIn PDF document text
    • http://dirtygirl.fun/audio_to_text_software_freezdhot.pdfIn PDF document text
    • http://govnosiakxws.online/jukezogobeist7d.pdfIn PDF document text
    • https://bepixumute.weebly.com/uploads/1/3/5/3/135302933/74cada7abc9f81.pdfIn PDF document text
    • http://jisuvakuwiraza.medianewsonline.com/zijolutamet.pdfIn PDF document text
    • http://neuroncraft.online/remington_700_308_tactical_barrel_twist632my.pdfIn PDF document text
    • https://gofolonuk.weebly.com/uploads/1/3/4/3/134313710/soxutanop.pdfIn PDF document text
    • https://kokubuzo.weebly.com/uploads/1/3/4/0/134017800/rubak.pdfIn PDF document text
    • https://ziwarafe.weebly.com/uploads/1/3/4/3/134306838/3e21cae315.pdfIn PDF document text
    • http://wowovamofuzo.sportsontheweb.net/sheet_metal_forming_methods.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/FjdNicf/jukizasosemimitu.pdfIn PDF document text
    • http://letxxnx.org/lien_waiver_missouri_templatexuvm8.pdfIn PDF document text
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/lixexaguwu-gununupusu-repumaworam.pdfIn PDF document text
    • http://vertigoa.online/42873397295ssept.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitujiduruv.myartsonline.com/barron_s_gre_math_workbook_4th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/monthly_task_checklist_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/do_i_need_to_take_iodine_while_breastfeeding.pdfIn PDF document text
    • http://fazovalekotevo.onlinewebshop.net/centrifugation_notes.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_off0000f889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF889 5088 bytes
SHA-256: d0cd039f0799168bcd57096b4c1e082a499b9002bacf3c450651204784c5666b
font_01_sfnt_off000109bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 11080 bytes
SHA-256: cd2030d3a227226e1320a280b433904868d4d16149d0df938c0c26b5f987ca21

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