Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b607b914733b97…

MALICIOUS

PDF

78.1 KB Created: 2021-03-01 00:38:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8e7cb610cdb152215b99e88b4fbf544e SHA-1: 3772c4ee8329906c920071e3c730570db572dcd9 SHA-256: 46b607b914733b979fe4efffc873395bf186d642cf72c46b270f0829bd29c203
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of external URIs, including one hosted on disposable infrastructure, suggests an attempt to redirect the user to a malicious site or download further payloads. The document body, though heavily obfuscated, contains metadata related to PDF generation and potentially keywords for search engine optimization, which could be part of a lure.

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://xezojetit.ru/wix?keyword=applied+longitudinal+data+analysis+pdf+download PDF link annotation
    • http://help-ruleviolation.com/bootstrap_input_table_template0z8gy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453720/normal_603297c948add.pdfIn PDF document text
    • http://casbah2point0.com/55902114343aaa38.pdfIn PDF document text
    • http://hrushch.space/sopaviv5mqe.pdfIn PDF document text
    • http://websecurer.tech/computer_network_interview_questions_and_answers_for_freshersofmdg.pdfIn PDF document text
    • http://trysucre.pro/skeptics_annotated_bible_refutedhsdhh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_6016417b7598c.pdfIn PDF document text
    • https://gumewutudeg.weebly.com/uploads/1/3/0/8/130813982/f522b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454977/normal_5ffddb5e2c1fa.pdfIn PDF document text
    • https://siroxejuvumuku.weebly.com/uploads/1/3/4/6/134657252/3308452.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/morulovekugifugopak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487622/normal_5fe06e164fb1e.pdfIn PDF document text
    • https://vutavevivusupe.weebly.com/uploads/1/3/0/7/130776898/ponefu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/miwanavatovuvibiwilagup.pdfIn PDF document text
    • http://fanedabomo.epizy.com/creusabro_8000_data_sheet.pdfIn PDF document text
    • http://zimemotom.rf.gd/eu4_1._25_byzantium_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/40900525351.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/watogelu.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/90321729980.pdfIn PDF document text
    • http://nifibomagogov.rf.gd/wawemozajalifizetegasuzib.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/back_titration_exam_questions_and_answers.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_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 5296 bytes
SHA-256: 967c7406a2dc81d22075eebca7c665b29b9961d6f2814c595ff717bfa17fd9fe
font_01_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 10316 bytes
SHA-256: a303a7899de01ec1324104b3ac1dd854431c3e9f13aaa5db2622302fcd7c2274

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