Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffd4cc55c72fc42…

MALICIOUS

PDF

75.8 KB Created: 2021-02-21 09:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d81562d24c7da49e1321b7d8296416e2 SHA-1: a0b444278dd5a319e8ed9bfcff00104264620b62 SHA-256: 8ffd4cc55c72fc42ac27ac9ae7d5df6f37319fdb000e3e25ad05f1a37b26d38a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to deceive users into downloading other files. The document body, though heavily obfuscated, contains references to 'The six sigma way pdf free download' and 'wkhtmltopdf', suggesting a lure for business-related content. The presence of numerous external URIs, including a link farm heuristic, indicates an attempt to redirect users to various other PDF documents, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=the+six+sigma+way+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/kuderoxuz/bkgiihG/55723140594.pdfIn PDF document text
    • https://jotafeke.weebly.com/uploads/1/3/4/0/134096025/a5262d6e625b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370767/normal_5fcd8c87b668a.pdfIn PDF document text
    • https://cdn.sqhk.co/libewepigux/b1GcwgP/puzokefofolelebute.pdfIn PDF document text
    • https://ruwiderok.weebly.com/uploads/1/3/4/8/134891429/pelakufujo_jepiko_benufujibexu.pdfIn PDF document text
    • http://tekijanimawov.22web.org/tejapomaxanav.pdfIn PDF document text
    • https://lovarewido.weebly.com/uploads/1/3/4/3/134322716/ketabirapide-wuxozododile-xusejawiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_600bd27e5de51.pdfIn PDF document text
    • https://zewurutivuzaned.weebly.com/uploads/1/3/4/8/134888434/riralafunexaru.pdfIn PDF document text
    • http://zawotagulokexa.iblogger.org/congruent_triangles_coloring_activity_worksheet_answers.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/wazagidonux/zesozufiwaladomifugu.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/94809227986.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/german_for_beginners_book.pdfIn PDF document text
    • http://leligikolapib.epizy.com/annual_report_toyota_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/72185285703.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/this_love_davichi_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/93334740956.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/jadukutefedovawebezope.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/simplifying_radicals_with_variables_and_exponents_worksheet.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_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 5664 bytes
SHA-256: be6dc8b6e4082b832a829e587692dfce6e6c7257530d03492f6d3927fbb6a9ea
font_01_sfnt_off0000ff28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 10156 bytes
SHA-256: aad534dc1eb2f7b8530a7f8c0673ce3467acee7d14481e1e7f662dd8c6bceb7f

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