Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc0d587c6a0c486…

MALICIOUS

PDF

74.5 KB Created: 2021-04-09 21:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8ffed9188582ba9eca16af7c512883cd SHA-1: c948e0c2e968d363224de414dad025410bd80417 SHA-256: 8fc0d587c6a0c4865aa0bdd7cc4a586228caa7255bca6a139bdbef15440db9fc
284 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and point to redirectors, indicating a link farm designed to distribute malware or phish users. The presence of a critical ClamAV detection and ML flagging further supports its malicious nature. The document body, though heavily obfuscated, contains text related to a book title and application metadata, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+many+words+are+in+diary+of+an+awesome+friendly+kid In PDF document text
    • https://nirasiban.weebly.com/uploads/1/3/4/3/134344158/905fba83f.pdfIn PDF document text
    • https://zimavilagapiwe.weebly.com/uploads/1/3/2/7/132712623/7027063.pdfIn PDF document text
    • http://vokukaguvez.iblogger.org/interview_questions_and_answers_for_fundraising_position.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/13a617b2.pdfIn PDF document text
    • https://mosejibufo.weebly.com/uploads/1/3/4/4/134437632/vilopuguduk-nexugusisux-vemewu.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/6cfb5151676.pdfIn PDF document text
    • https://sivipekuz.weebly.com/uploads/1/3/4/5/134596285/fapulet.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/juzinaramip/rakeb.pdfIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_9d534d5bfe4a431984bfbe80a2192701.pdf?index=trueIn PDF document text
    • http://gisoduriri.rf.gd/gopolegofedawiwowiwa.pdfIn PDF document text
    • http://lejepaxe.rf.gd/15044829887.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_a877b21a3d584d3394797a2e2c20e9ef.pdf?index=trueIn PDF document text
    • https://63a0a607-6d1b-4b95-a813-f1b07cabc719.filesusr.com/ugd/ad56f2_630ccb6220384354830d320a59782d1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/27329382116.pdfIn PDF document text
    • http://xoxinazur.rf.gd/fanusa.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/8240970180.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/what_is_a_text_structure_example.pdfIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_7a6d87c0a2544e38b236415ecc09a978.pdf?index=trueIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_fee8200f837946998da29b8450d718ae.pdf?index=trueIn PDF document text
    • https://9005981c-20a7-4b93-9dfe-a591c0bc6fcf.filesusr.com/ugd/afbba5_3058fbaa24e34dcb80c90afcb2529fe4.pdf?index=trueIn PDF document text
    • http://kafojifonetawaj.rf.gd/zedeji.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_off0000e6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 5272 bytes
SHA-256: b27cb6eff06eb54d44274674f3ec498729a1699b6dc67b31f902708a0cbbfd8b
font_01_sfnt_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 10500 bytes
SHA-256: 9e5fadfcb226c12bdc23051460510ab12ab9ad6de0de8d51254683efe2716f63

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