Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c29473849734ae…

MALICIOUS

PDF

95.4 KB Created: 2021-05-14 00:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2ab31a0f5ce1ef7fcf978acc704c467d SHA-1: 42c196b199049dd6207297a54e805d62276488ad SHA-256: 92c29473849734ae35b8112ddae78a2d10b96d58dd7de4ea5342a5a96a3b6ad1
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The embedded links, such as 'https://dafemum.ru/strik?utm_term=light+novel+anime+adaptations', are designed to lure users to potentially harmful websites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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 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=light+novel+anime+adaptations In PDF document text
    • http://datinge.site/89421505152l12n.pdfIn PDF document text
    • http://suporefebakibur.mygamesonline.org/dinike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_6055966d80051.pdfIn PDF document text
    • http://world-wildshop.com/how_to_calculate_distributed_loadg3fou.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/wenegik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_606e55fa92599.pdfIn PDF document text
    • http://zoomita.fun/53652055307sbyto.pdfIn PDF document text
    • http://sibatotud.iblogger.org/amelie_vals_piano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419424/normal_5fcbbe7c66655.pdfIn PDF document text
    • http://easycreditscore.info/government_of_antigua_and_barbuda_passport_formsl5jk3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449992/normal_5fdd32f6e55d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fadudenomo.onlinewebshop.net/62312658262.pdfIn PDF document text
    • http://fixobijuruloluk.rf.gd/37504869483.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/55143788823.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/lopuwedazuxuruzugofabuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e29d9584-f139-4600-b0b1-2d279a6ee817/tolstoy_war_and_peace_characters.pdfIn PDF document text
    • http://gegepazanonera.rf.gd/67395825053.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/marathi_actress_photos.pdfIn PDF document text
    • http://xorirefojexo.rf.gd/kovosibek.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/ain_t_your_mama_song_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c92458d-fc45-4b79-9004-20e5cd5de5d6/modern_calligraphy_font.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e96563-759e-4088-9895-0d8360727e84/92934218948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34f7175c-5fae-4447-8b21-36ba6c724f8d/what_is_qualitative_research_in_health_and_social_care.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_off0000fb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0F 19632 bytes
SHA-256: 56e36935aa5bedcd0b5d4addbba25b55e7393ef49fe2c036d5f38139288a5c65
font_01_sfnt_off000138e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E6 5276 bytes
SHA-256: dff93f940a98f6d359aadc7c6fe4583e865c778d252ecba923682288d40fe900
font_02_sfnt_off00014ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC1 11072 bytes
SHA-256: 585cc329c8782f02af8a23c00a318399f576d98f599596e2f19baf62788b9c24