Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80618b5e8e6ef51…

MALICIOUS

PDF

79.0 KB Created: 2021-04-07 08:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: da41daaaaeb74444c58c13109ec5edcc SHA-1: c2b2ded4680566b27b87cae0779b552216f789bf SHA-256: c80618b5e8e6ef51f1888d7e703daf8cc3e0ef7fed9a72189a22bb4fdbfc28ea
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to suspicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of link farming on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is part of a malicious campaign, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jumiwimov.ru/award?keyword=better+work+together+pdf PDF link annotation
    • http://fapseo.ru/oxford_english_pronunciation_dictionaryq5dre.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393359/normal_603ba7031420c.pdfIn PDF document text
    • https://keboxatoxumire.weebly.com/uploads/1/3/4/5/134591907/sedim_dojidokofi.pdfIn PDF document text
    • http://tujofuzenej.iblogger.org/54052867623.pdfIn PDF document text
    • https://dasowafajego.weebly.com/uploads/1/3/4/7/134723411/sazadodenadu_mimako_puwesotipel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_600efffa065bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392868/normal_6055074b1e299.pdfIn PDF document text
    • http://dakujuzoma.22web.org/wanevus.pdfIn PDF document text
    • http://kuvelopomegemes.iblogger.org/ascent_infinite_realm_pc.pdfIn PDF document text
    • https://tajonerimokop.weebly.com/uploads/1/3/4/8/134879789/fcc0dbc97264.pdfIn PDF document text
    • http://pankreatitum.ru/chris_hemsworth_and_tom_holland_in_the_heart_of_the_seat1v76.pdfIn PDF document text
    • http://stopnutristrike.ru/toyota_corolla_2016_motor_oil_type8j2nn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484399/normal_602006a302006.pdfIn PDF document text
    • https://puwawegolawibot.weebly.com/uploads/1/3/2/6/132682739/zojewezesokig.pdfIn PDF document text
    • https://pekatube.weebly.com/uploads/1/3/5/3/135393066/rawul_fozexibosafox.pdfIn PDF document text
    • http://betukekotulodew.22web.org/73723155798.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/kisimujuk/64786363539.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/wizutiz.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/tigexirajitawafegitaba.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/juzixagov.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_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 5088 bytes
SHA-256: 8ed27f0ef80dff62d484c93426eb19e248cd1d687cd75c4ead29d571981d9084
font_01_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 10908 bytes
SHA-256: cfca14a3a5935c6d87e3fb5b2135758177cf411f4ddb52ec5f4142b4c129c1af

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