Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ae1dd392d6bd8c…

MALICIOUS

PDF

75.8 KB Created: 2021-02-22 19:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 04cdf585caef9ba152d12fa03612bda3 SHA-1: ef8ddaa8fb6a06f0e086d7dec7c665a8cc56cccc SHA-256: 49ae1dd392d6bd8cfd25b6f23ba3ec25daa2a414bc07269a70fa1dfb5784d41d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure at 'https://yafferge.ru/strik?utm_term=skaven+pestilens+battletome'. The document's structure and numerous links suggest it functions as a link farm, designed to direct users to potentially harmful sites. The ML classifier and ClamAV also strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/strik?utm_term=skaven+pestilens+battletome In PDF document text
    • http://mumiwimag.iblogger.org/toyota_avanza_g_manual_2014.pdfIn PDF document text
    • http://deviditiposu.iblogger.org/how_do_i_join_two_kallax_units.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414494/normal_5fca273e4538c.pdfIn PDF document text
    • http://baby-slings.ru/how_do_you_define_public_relationss4oe3.pdfIn PDF document text
    • http://omerkatanalp.com/31309557244puawr.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/writing_complex_sql_queries_examplesobkiu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385424/normal_602b3bc8b65df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494440/normal_60097b86040c6.pdfIn PDF document text
    • http://persequenteamsohbet.com/nivuvuwatamivoxo4wvt.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/wiremeresegikon/20600513754.pdfIn PDF document text
    • http://wokofidikud.epizy.com/internet_explorer_8_free_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/civilization_4_beyond_the_sword_strategy_guide.pdfIn PDF document text
    • http://nerusejide.rf.gd/vsco_cam_crack_apk.pdfIn PDF document text
    • http://robirevi.epizy.com/naming_saturated_hydrocarbons_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/durofej.pdfIn PDF document text
    • http://gipenebome.epizy.com/rcog_guidelines_for_rh_negative_pregnancy.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_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 5024 bytes
SHA-256: d09ae04861377ea3dd4a9f977d7fa8cfe990345b08078e33a3f0815607d62c30
font_01_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 10516 bytes
SHA-256: 9b7691b8e0a0a21a8280e156f3fe3a6b0fb44e0fd8d7c8e883c4be5adf064c1c
font_02_sfnt_off00011433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11433 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378