Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc176cfbd7fe8d4f…

MALICIOUS

PDF

76.3 KB Created: 2021-02-16 23:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: fa6614c2b2f431609077cccfdad10dbc SHA-1: 5e1deae6899efc5e14d083f67d97894b7c308c48 SHA-256: cc176cfbd7fe8d4fd90b30acd0d1aa9f8d9721c4c758acff378b266188fe79de
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a potential lure for printer installation help. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and a link farm heuristic further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=how+to+install+canon+pixma+mg3520+printer+without+cd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382190/normal_601144bbb7bfc.pdfIn PDF document text
    • http://bodikakib.22web.org/aristophanes_kular.pdfIn PDF document text
    • http://jelenus.iblogger.org/what_are_outbreaks_epidemics_and_pandemics_worksheet.pdfIn PDF document text
    • http://fobifisoba.22web.org/dojukigoxipafe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448558/normal_6001369f7f858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_600dc1478d14b.pdfIn PDF document text
    • https://buwuwewofopalun.weebly.com/uploads/1/3/4/0/134097592/2427540.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fujalur.epizy.com/gramtica_de_ingls_para_brasileiros_download.pdfIn PDF document text
    • http://nitasoginit.rf.gd/hvac_technician_resume_format.pdfIn PDF document text
    • http://mijikabetabup.rf.gd/bovimivulipe.pdfIn PDF document text
    • http://tigaxulajaju.epizy.com/english_grammar_test_with_answers.pdfIn PDF document text
    • http://fusopub.rf.gd/288114422.pdfIn PDF document text
    • http://lunofalogejutu.epizy.com/beginners_guide_to_learning_japanese.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_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 6172 bytes
SHA-256: 112d370af2de279bbb62e60f6856507fb353e699d0d11d552a8425200f22d012
font_01_sfnt_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 11112 bytes
SHA-256: e0635e51b23658b533d1c26c235394e4d1cf72ea136d637999fb2518f13b730c

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