Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a927b79699d1afb…

MALICIOUS

PDF

86.1 KB Created: 2021-04-17 07:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e137f0bcdbd4681944326c7d843c68b6 SHA-1: b18ecd23245ccb9e469ab80368a126a449edc47e SHA-256: 5a927b79699d1afb380b36b40cfd00afb20214317adc5bbfa955b350920c0cf2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the sheer volume of links point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=is+delta+strict+about+carry+on+size+2019 PDF link annotation
    • http://supernefritroller.xyz/exercise_for_seniors_with_parkinsons_diseaseh1xi7.pdfIn PDF document text
    • https://cdn.sqhk.co/wopeporamo/VjfK2vT/guide_car_restoration_3d_printing.pdfIn PDF document text
    • http://geguxejap.22web.org/yamaha_mgp32x_mixer_32-channel_price.pdfIn PDF document text
    • http://cheapkeys.site/pot_of_gold_plautussn833.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/hip_flexor_strain_rehab_protocol.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/hunger_games_trilogia_ita_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484818/normal_5fd6ec67d2e24.pdfIn PDF document text
    • http://guroxufe.iblogger.org/58551261703.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419640/normal_5fc94dce96346.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/sojodagerefalido.pdfIn PDF document text
    • http://sputnews.com/muposobefaguwujio6o1l.pdfIn PDF document text
    • http://silver35.ru/niguwupudonosughnjsy.pdfIn PDF document text
    • https://cdn.sqhk.co/porifepi/ehieFjR/antibioticos_elsevier.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/8623732397.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5fc6c67e111f9.pdfIn PDF document text
    • http://goxamid.mypressonline.com/72649430506.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/9hdgyhd/amazon_alexa_deals_of_the_day_kindle.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/vipinib/69342608662.pdfIn PDF document text
    • http://jutuvilulador.epizy.com/aa_12_traditions_history.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/s_a_t_a_full_form.pdfIn PDF document text
    • http://nukuliw.rf.gd/how_to_program_my_clicker_garage_keypad.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/vobegotebetusuxalaza.pdfIn PDF document text
    • http://kizosarosuvi.rf.gd/metabolism_reset_diet_christianson.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_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 5528 bytes
SHA-256: 0a159e7f3fd7a2dd893e6f23e36d998a7d341966188b75a791d7ce76b6d4775f
font_01_sfnt_off000113a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A2 11508 bytes
SHA-256: fc1323d063bd85bf1faa2bb8e189d300426f3b920519bbdd9c0d8f7e5678ac23
font_02_sfnt_off00013b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B10 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333