Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fee87edffb4080d…

MALICIOUS

PDF

76.2 KB Created: 2021-02-09 22:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7d845252ed2aae7a850a55a4a9bb1c73 SHA-1: 14fbd5791f826c7475141e760e32ccd9916b5dd4 SHA-256: 3fee87edffb4080d7bc8236422145c45fb63def0fe8211e2ea0456cea47468df
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to disposable domains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/123?utm_term=oso+hormiguero+en+ingles PDF link annotation
    • http://bosuloridulumo.22web.org/15064724925.pdfIn PDF document text
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/batepirudeposu-nenedupog-silen-fidizoxizoxogo.pdfIn PDF document text
    • http://sefesipodaj.22web.org/capital_expenditure_and_revenue_expenditure_definition.pdfIn PDF document text
    • https://losuwigawoje.weebly.com/uploads/1/3/5/3/135304717/zenotikimeti.pdfIn PDF document text
    • https://sowotelimavo.weebly.com/uploads/1/3/4/0/134000290/libixa-jusaz-gazoxurasufuxaj-lomurepodujufa.pdfIn PDF document text
    • https://jaxikagiwuzeno.weebly.com/uploads/1/3/4/6/134698588/wopaguwa_rewamew.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://duvufewitopemaw.rf.gd/xufupivuxo.pdfIn PDF document text
    • http://sokexodine.rf.gd/23583693373.pdfIn PDF document text
    • http://kepujelibip.epizy.com/derorevowadaki.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/75030316790.pdfIn PDF document text
    • http://zapofekeba.rf.gd/panuger.pdfIn PDF document text
    • http://rifunasi.epizy.com/33819745618.pdfIn PDF document text
    • http://zipoxibel.epizy.com/acc_aha_guidelines_2017.pdfIn PDF document text
    • http://ruwiluleter.epizy.com/good_answer_traduction_en_franais.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/login_register_form_design_template.pdfIn PDF document text
    • http://podifugugak.epizy.com/74003101305.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F7 4720 bytes
SHA-256: 57c384549e905137487d4013cd9f5a4193629f7217f9d99d3a7914a3fedfbc77
font_01_sfnt_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 11824 bytes
SHA-256: 2b815a3cd5e7801fcd1843c9d6d17d5f002c588b7d77b5e169c13945d41ede8a
font_02_sfnt_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 16068 bytes
SHA-256: bd4ec210b6f0bed3603b49d512cd9a08d3e9d1e81fcf206800274a46106400dd
font_03_sfnt_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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