Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ff6278d597dd14…

MALICIOUS

PDF

73.0 KB Created: 2021-04-05 12:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5386eb1dac8f497670d3b9631066c449 SHA-1: b00b76054a611c9fc7f1093a8449d06cc1546e45 SHA-256: 76ff6278d597dd142cf418fb7647aa6220c80d3c913b322842819c16c17b10a8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or content-luring attack, likely delivered as a spearphishing attachment.

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 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.
  • 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://botokaw.ru/award?keyword=vba+excel+pdf+chomikuj PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427267/normal_60152ad0280ed.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/rGjbia2/quran_recitation_with_english_translation_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/j7SB0ie/watozexewoxemelunu.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/hhNdH0D/best_laptop_for_college_2019_consumer_reports.pdfIn PDF document text
    • https://cdn.sqhk.co/sadopore/hfAiegc/fufivemulofu.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/hbN7akc/turkish_ringtones_and_wallpapers_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375204/normal_6054f4c902fa3.pdfIn PDF document text
    • https://cdn.sqhk.co/rewufarelaze/bdcjfjf/87239625857.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/Ihhcijs/artificial_nails_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/boketumejipa/Sheghja/xolatarezeliwuzezaje.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzezajolu/ge6jbVG/rummikub_game_amazon_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_b7de71d48a7f460c8330c7b77a62129e.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_6de02884928d4189aea514fa09849a54.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/60320795171.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/81291496745.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/jonivewozuselogefokiru.pdfIn PDF document text
    • https://4e16d9da-0927-4957-8a4e-4544605d6055.filesusr.com/ugd/d7e550_bfeed974cb3a4fdcb44047ea473486f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/lease_accounting_sap.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/xabirakiref.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/how_is_gdp_used_to_measure_economic_growth.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/cabal_game_for_pc.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_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 5436 bytes
SHA-256: ced21d2e64f043e98a73bd5d3ae78026279ccf9a749ccc0ddb97dd4d63054fd4
font_01_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 11084 bytes
SHA-256: 5ca3c250fa2decbefdec8999fec7a614a82aef8c9e69a3bcd0576ecde27e68f3

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