Malicious PDF — malware analysis report

Static analysis result for SHA-256 54bb76d4a5128e35…

MALICIOUS

PDF

115.0 KB Created: 2021-03-28 22:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e1728dce40f9cba715fcda094f466abf SHA-1: 72eedb6f142a8fe4f48f25778c115edbb24f451a SHA-256: 54bb76d4a5128e357cb531eb36dc2ed0d4009a70ade05e8379dcd2601280c017
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of these numerous external links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=what+does+up+to+30+mbps+mean PDF link annotation
    • https://cdn.sqhk.co/depadukat/hjC3elV/58735950856.pdfIn PDF document text
    • https://fexiganariv.weebly.com/uploads/1/3/0/7/130739648/makidile-gelap.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxaletadi/MUijwTd/7396187366.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374857/normal_5ff4051fa161f.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/cHidgfd/minecraft_villager_news_update.pdfIn PDF document text
    • https://negogepif.weebly.com/uploads/1/3/0/7/130775604/witedowifazuvus-regoledoloteze.pdfIn PDF document text
    • https://noxajigaja.weebly.com/uploads/1/3/4/6/134698193/dumogotirisapirif.pdfIn PDF document text
    • http://boribonabone.mypressonline.com/sat_test_scores_meaning.pdfIn PDF document text
    • http://goxamid.mypressonline.com/apprendre_a_lire_une_partition.pdfIn PDF document text
    • http://noxaduva.mypressonline.com/16478541397.pdfIn PDF document text
    • https://wikexamug.weebly.com/uploads/1/3/5/3/135343860/9886335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445739/normal_6030f7b0a2597.pdfIn PDF document text
    • https://doritader.weebly.com/uploads/1/3/4/8/134885844/9284576.pdfIn PDF document text
    • https://cdn.sqhk.co/danopefasuf/6zAB5z9/tufuto.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/jWxggwH/how_to_solve_brain_test_level_38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371004/normal_5fe3f37f096af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372753/normal_600eaf6ba765a.pdfIn PDF document text
    • http://gazedalepi.sportsontheweb.net/cambridge_checkpoint_science_workbook_1_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sanojuxako/tqhhhhF/fitupemafimeligowebevi.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/mejobu/zoretezif.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/pagubimalumisedibefa.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/auxiliary_verb_file.pdfIn PDF document text
    • http://rovizomaguwex.atwebpages.com/22170784959.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_off000174ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174EF 5364 bytes
SHA-256: 224da5a34f6780b903e9818ea33be2c6320effa218f79cc5a113a054ad621900
font_01_sfnt_off00018704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18704 11708 bytes
SHA-256: 833934600cdcb91b75b9f8021e150ac31bf12dd64a139a01a08c9d58969b6aa7
font_02_sfnt_off0001aea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEA6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176