Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f00c64bf4b46820…

MALICIOUS

PDF

77.0 KB Created: 2021-03-12 19:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2cc0d6bd1d13148ae42ef029e6efd663 SHA-1: 4454493de85aa6e535e231e7d3c868c72092a0ea SHA-256: 4f00c64bf4b4682047e5bf0dec565f303c2948e01d6e0f86b95f6ebef066b952
186 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/aws?utm_term=systemverilog+typedef+parameterized+interface PDF link annotation
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/bikazivatenowaposika.pdfIn PDF document text
    • http://trenolgia.buzz/how_much_do_regional_managers_make_at_planet_fitness6f3xq.pdfIn PDF document text
    • http://1xbet-football.fun/98013917048h7ggz.pdfIn PDF document text
    • https://sibezabivodigif.weebly.com/uploads/1/3/1/4/131407310/dozarugap-rodedejetalewef-bavelepipoga.pdfIn PDF document text
    • https://visofamawuri.weebly.com/uploads/1/3/2/3/132303269/f583e59d97df092.pdfIn PDF document text
    • http://proita.space/79251810339wzzuz.pdfIn PDF document text
    • http://my-favshoph.online/77643250550xvfbp.pdfIn PDF document text
    • https://pezujereg.weebly.com/uploads/1/3/5/3/135349759/5f97c.pdfIn PDF document text
    • http://legionmone.xyz/901754443750vqi3.pdfIn PDF document text
    • http://stopnutristrike.ru/dub_community_of_russian0ij3.pdfIn PDF document text
    • http://republvinb.fun/lotukibexunavxarog.pdfIn PDF document text
    • https://sususijofazitut.weebly.com/uploads/1/3/4/4/134462406/togufefu.pdfIn PDF document text
    • http://bullbananavannaone.xyz/impact_of_demographic_factors_on_businessq3hxj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_7b9d1029729c4ffc84ac6e7ac7d98434.pdf?index=trueIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_63f091b36bb5438c9140440ba409c51f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/denon_avr_1912_receiver.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_ae4d4277ae17430da08eda56dfb296c8.pdf?index=trueIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_e670156abaa34f2f924dadb43fd9e2bb.pdf?index=trueIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_d066805e8f0e4375baa09bc99471dfd1.pdf?index=trueIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_4761d1195e0e468195da9e161d6da2cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/defujo/3049306441.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/phosphoryl_transfer_potential_definition.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_c9f91f54eb324de6ba4c846fadec439e.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_01db9e4b022d4219b3b59423adbf2a15.pdf?index=trueIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_c249d4025732421b88aed9f9df004ff5.pdf?index=trueIn 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_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 5788 bytes
SHA-256: c708affef14401dffeaedc7165c77a6e0fdcc174de7bd8bc91b64a295868e43b
font_01_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 11340 bytes
SHA-256: c3ecf12f5e467595ffba703a60ddc2bce5e5e310a62fe3a22bfaa11282f0171b

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