Malicious PDF — malware analysis report

Static analysis result for SHA-256 353ea3d1d11a0a5d…

MALICIOUS

PDF

77.2 KB Created: 2021-05-12 07:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7de9ae91fc9ef02853f1ff8d5ce5ddc0 SHA-1: 5f9380398e351f73eec6b80f560085c34d94d954 SHA-256: 353ea3d1d11a0a5dbe3af360e9be84c66f562f8d2e1bf59e427ad3fa3f7d7bb0
244 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. It contains a large number of embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=2013+honda+pilot+service+manual+pdf In PDF document text
    • https://cdn.sqhk.co/zegareguw/gcwghje/notelesisuboruvuf.pdfIn PDF document text
    • https://pimusaxasoj.weebly.com/uploads/1/3/1/8/131856122/791407.pdfIn PDF document text
    • http://dofegogojewipo.iblogger.org/super_mario_bros_2_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/ii1iach/sporosarcina_halophila_characteristics.pdfIn PDF document text
    • http://midokasek.iblogger.org/lisukirelokadijufu.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/jjiFHro/vewimogiseru.pdfIn PDF document text
    • http://mazezoda.22web.org/78400334292.pdfIn PDF document text
    • https://sokifaxus.weebly.com/uploads/1/3/4/6/134666683/503b9538b.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/dgcihaB/churrascaria_plataforma_nyc_restaurant_week.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/jfNyjbi/89046001208.pdfIn PDF document text
    • https://salotoniv.weebly.com/uploads/1/3/5/3/135305201/59524.pdfIn PDF document text
    • https://cdn.sqhk.co/nokowifupe/Le4OibT/red_sun_rising_band.pdfIn PDF document text
    • http://gawetuzunugigos.iblogger.org/cantata_unit_testing_tool.pdfIn PDF document text
    • https://cdn.sqhk.co/nezupusovefi/cMHvB19/easy_street_the_life_simi_valley_ca.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
    • http://wekumut.epizy.com/best_online_shooter_games_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d9fb1f-4eb5-4dd5-b43a-02d546b5bdf4/jevesajedosuxakaze.pdfIn PDF document text
    • http://xupanapil.epizy.com/48690105633.pdfIn PDF document text
    • http://towupew.epizy.com/tropa_de_elite_parents_guide.pdfIn PDF document text
    • http://wukosow.epizy.com/50868122731.pdfIn PDF document text
    • http://lugirike.epizy.com/rogimilavoxumozesatili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/199e7b06-838f-4cf9-a99e-6f4a7bb8fcd1/busupinutufadedefubotoju.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_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 5732 bytes
SHA-256: d59997d47cccf25124a760ea0aa1e5bdb5acd9da2885082eb618bad3f9c5cdb8
font_01_sfnt_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 11200 bytes
SHA-256: 5e73f0d5eb35cea99fe5a824abc043c9c7f28ae4df05b816de7f6f1c3b043f93
font_02_sfnt_off0001192e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e