Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8252306939228f…

MALICIOUS

PDF

73.9 KB Created: 2021-05-13 09:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dacea9934ef190e96f44b11118ab05df SHA-1: 7ab3164618dcbb514495760b85e9b1341b3b8929 SHA-256: 5c8252306939228f90b041d12cfdea0226e5f3d171800baf159a68e3581655f0
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a significant number of external links, with many pointing to disposable hosting and exhibiting characteristics of a link farm. One URL, https://gimoguvi.ru/strik?utm_term=what+is+islamic+architecture+pdf, appears to be a redirector. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to lure users to malicious content, potentially as part of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=what+is+islamic+architecture+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444115/normal_5fee0e874fc8e.pdfIn PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/6253192.pdfIn PDF document text
    • http://contact-git.top/6.5_linear_inequalities_worksheet_answersqxla6.pdfIn PDF document text
    • https://vukajikabazaxeg.weebly.com/uploads/1/3/4/7/134711597/902917.pdfIn PDF document text
    • http://uscreditinquiry.info/5082617018cc3pg.pdfIn PDF document text
    • http://mnogoturov.com/missing_punctuation_worksheets_ks3iyggl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403937/normal_606109407a07c.pdfIn PDF document text
    • http://huseyincanx.com/diccionario_de_arquitectura_y_urbani2cl7a.pdfIn PDF document text
    • http://nabenopavaz.iblogger.org/recycle_bin_apps_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nibewisule.epizy.com/peregoxegowemajev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc1b525-4738-438f-80f4-d082ba4a9fe1/69438018303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad814f22-ca9d-4d03-b81e-125815c3a84f/types_of_diagnostic_tests_in_education.pdfIn PDF document text
    • http://vojasokizew.epizy.com/zemorije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be826a30-28ca-4758-a26f-000566fdea33/53674459463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d176bcd4-0273-4584-8466-4a494480438b/wifi_smart_camera_v380_price_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d036038-0609-4473-b58e-d7307bb64ea8/free_diary_of_a_wimpy_kid_the_getaway.pdfIn PDF document text
    • http://ligubulativov.epizy.com/how_much_does_a_senior_design_engineer_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac87e67-364d-4d9c-b83a-6dcdb3508d8c/70471036977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f05b6c0-7cfa-46f4-a0e6-5cf02a754ff5/acer_t232hl_manual.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_off0000e507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE507 5408 bytes
SHA-256: a06bda2aee8731bc5cdd7655be144f5dd8b25ba6783ed9b7e2c9ef0c08c12e73
font_01_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 10652 bytes
SHA-256: 341047c0859061aabca10444159816163a7170a6c7a5bc030d681ab0cf8cab7b