Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0a65d897672997…

MALICIOUS

PDF

71.4 KB Created: 2021-03-20 00:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e1d3f6d76ca91dba15e4bf928d712a8b SHA-1: 9d204c99900aee5a82aefdd36c793d7f13353545 SHA-256: 3b0a65d89767299741efa2edb720ec244608c099dda35985acd76b350cbd4b8f
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier strongly indicates maliciousness, and the presence of numerous external URLs suggests a potential distribution mechanism for further malicious content or SEO abuse. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://druttle.ru/123?utm_term=3d+max+models++free+furniture PDF link annotation
    • http://stankoff.org/hindi_consonants_worksheet_for_grade_10vppb.pdfIn PDF document text
    • http://ledimpress.biz/similes_in_the_crucible_act_17h9uw.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibowaxus/7inhaOS/4628199630.pdfIn PDF document text
    • http://goshop32.site/sefapaf24nt9.pdfIn PDF document text
    • https://ritesevegozuvij.weebly.com/uploads/1/3/1/6/131606822/f8caa9.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/dRSrjjA/twisted_metal_3_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/hi6jhjd/sweet_garden_blast_puzzle_game.pdfIn PDF document text
    • https://tipuxefisabe.weebly.com/uploads/1/3/4/8/134846761/1615213.pdfIn PDF document text
    • https://cdn.sqhk.co/zuwojumabifa/bqpjeig/cara_buat_questionnaire_google_form.pdfIn PDF document text
    • https://tekaxudifen.weebly.com/uploads/1/3/5/9/135992886/wajopar_surokiji_tosabufozigoxa.pdfIn PDF document text
    • http://nosinoski.shop/xijulazamolokef59o6g.pdfIn PDF document text
    • https://cdn.sqhk.co/lunapolakezo/hblDf4j/67586275771.pdfIn PDF document text
    • https://cdn.sqhk.co/marebilan/jRGgfib/aua_guidelines_bladder_cancer.pdfIn PDF document text
    • http://ehaberdevlet.com/fosegorubolidopeja7mxm3.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/gfjghfH/the_real_history_of_thanksgiving_history_channel.pdfIn PDF document text
    • http://igme.site/kepuwemi9mwqf.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/jd35iiv/bbc_mundo_ciudad_de_mexico.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/iaDjf0I/vesujikavutefaruv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_4b09afe28436417fbbcfb8a68f538ebf.pdf?index=trueIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_71c9e0411e3f4117a0a36d347390ae41.pdf?index=trueIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_d03af4a8e466447e92070b632cbcc09c.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_282ab2cbf3284d7e82473086abc2fa69.pdf?index=trueIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_99cbadeae1054af1969ec9084847facf.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_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 5192 bytes
SHA-256: cdb8ba34f5d8f682189ced7506968ef4db8491353c8f8ee8876707d70d6d6ad3
font_01_sfnt_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 9904 bytes
SHA-256: 7f60e19ad4eaf86b921f64b205ca5104350ac84957bdc69fa5efd8138809142b

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