Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3877ff7312aa3f3…

MALICIOUS

PDF

75.9 KB Created: 2021-03-05 08:29:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8fdf864b824e3e61b5d5866fad35fa8e SHA-1: e0bc0d7224f3f05111aa216995c6e52657925937 SHA-256: f3877ff7312aa3f3d87bfc8fd56d2c4fc3de651999afd01dd4e9029b1bc86314
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable or unknown-reputation domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the malformed stream length heuristic and the presence of many external URIs suggest active content is being used to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://mezovuduw.ru/wix?keyword=judy%2527s+country+kitchen+milledgeville+georgia PDF link annotation
    • https://gepulepefuxogu.weebly.com/uploads/1/3/2/6/132683228/f46d78564260.pdfIn PDF document text
    • http://tryplafond.xyz/77155724327rzgrh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454543/normal_602fea2a7418d.pdfIn PDF document text
    • http://familyit.info/hlookup_example_in_excelhnm8l.pdfIn PDF document text
    • https://radumudoxelis.weebly.com/uploads/1/3/4/2/134235428/sugoduzej-fazirozufebij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_601d8a31a534b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365646/normal_5fee080517bd3.pdfIn PDF document text
    • http://jopkapopka.online/nisipxu7nq.pdfIn PDF document text
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/880944ecdda8654.pdfIn PDF document text
    • http://winwites.space/txdot_form_130-u_instructionsl36lm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417998/normal_6029efe3e5c5c.pdfIn PDF document text
    • http://wuzubofetaxoger.iblogger.org/who_is_ie_irodov.pdfIn PDF document text
    • http://fimewot.xyz/sony_bluetooth_headset_user_manualsyspd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxokagad.epizy.com/zowulozuzisofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63807d96-9f45-4944-ab59-a30eb9c7e1be/53832954945.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/react_native_animated._view_transform_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/defegiwudibap.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/tajetifakagofakabaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7476ff9-78cd-48ad-a513-1a1d19637b08/sarejilatolepugojujeno.pdfIn PDF document text
    • http://roritobefeda.rf.gd/raymond_chandler_best_books_in_order.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_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 5600 bytes
SHA-256: a2cbf5a1fbeca8648e8ad0f9eb2982c5154dd46429450d99ea29247d199ba6e4
font_01_sfnt_off0000fbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEF 10692 bytes
SHA-256: c032ef7dfba654bd347ce0e0ac7b6681887fe0030df184a01cb3e2fc11abb828

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