Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bcac5f14d21163…

MALICIOUS

PDF

81.0 KB Created: 2021-03-02 04:52:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 751274384e6208706227bcc530402eff SHA-1: 1bbef7d6d5a3a799de4d4af02a9473b54bab309f SHA-256: 33bcac5f14d21163fc8572732286045aa00b8dddae887197ef6de9775e021ba8
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to a 'Bosch shx68t55uc user manual' and is associated with a link farm on disposable hosting, suggesting a phishing or social engineering lure. The presence of embedded URLs pointing to external resources further supports the attack pattern of directing users to malicious sites.

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
  • 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://baarspo.ru/strik?utm_term=bosch+shx68t55uc+user+manual PDF link annotation
    • https://cdn.sqhk.co/dederubap/heEBKjh/24739204419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_600b137bae87c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_602cb4dfb4243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_6011e846972c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489852/normal_5fe7bdcaccf2f.pdfIn PDF document text
    • http://lighttravel-ng.com/oxford_discover_2_writing_and_spellingv8bza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_6031acb8787ef.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidevepip/ihfxijm/best_android_emulator_for_laptop_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/PhcF8ig/granny_square_crochet_pattern.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_5fe2a28d5e6b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370275/normal_6002e5c616bbe.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/dujgian/escape_the_labyrinth_ravensburger.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zotuxegusam.epizy.com/honeywell_chronotherm_4_thermostat_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/illinois_lpc_exam_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/ccs_university_exam_form_for_bba.pdfIn PDF document text
    • http://megisaduvivegi.epizy.com/81501996644.pdfIn PDF document text
    • http://dazokudinojo.rf.gd/law_of_contract.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/15723196460.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_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 5628 bytes
SHA-256: c5563a47e623dbdaf6f5dfcd091db4f5827bf8d35b287c7c4cbccd0699a972f6
font_01_sfnt_off00011152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11152 10940 bytes
SHA-256: befc1b8fca5e63b6c2142c3c94575886da1c2dbd6259611e71f2849f08781bd5

Open this report in the interactive analyzer, or submit your own file for analysis.