Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa12fd40e5692c7…

MALICIOUS

PDF

72.1 KB Created: 2021-03-04 20:07:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 858c25a8eb135811fac27d14e69bab7a SHA-1: 8cb83a63b010bee8d01c2a3ab6c91f5592b35e07 SHA-256: 1aa12fd40e5692c7ae81538d83e236b6a79c0d37e1cfadd2316deff05727f3bd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate maliciousness. The document body, though heavily obfuscated, contains keywords related to conflict resolution, likely used as a lure to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://golowaki.ru/award?keyword=conflict+resolution+techniques+for+youth PDF link annotation
    • https://xoxomupufolud.weebly.com/uploads/1/3/0/9/130969418/midulokosimop_xupulepiferukiw_xalib_risamewimu.pdfIn PDF document text
    • http://ig-copyrightnotice.com/298795156373h75p.pdfIn PDF document text
    • https://wopokajam.weebly.com/uploads/1/3/0/8/130874492/e977adb32185160.pdfIn PDF document text
    • https://xunujigunabiwuf.weebly.com/uploads/1/3/4/0/134017077/zafuvoditimolaj-muvotatumimo-taxawebegaso.pdfIn PDF document text
    • https://timivoza.weebly.com/uploads/1/3/5/3/135315173/5821167.pdfIn PDF document text
    • https://nagiliju.weebly.com/uploads/1/3/1/4/131412426/linuled.pdfIn PDF document text
    • http://czecheducation.space/ccdc_23dwauf.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/1851576.pdfIn PDF document text
    • https://fanarise.weebly.com/uploads/1/3/4/3/134377412/83ae49a7cb15b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_fa008a03ae9841a482afcc37124f9266.pdf?index=trueIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_eafa31609ace4b1e9d058e5939d36d8c.pdf?index=trueIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_32f88179d07143859374d6c6c196521f.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_9958edec6775434b93334303c9b1f62d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gogunabones/vezaf.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/37473787617.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_a086ba44f48e446f8bd2cfd05c249dfa.pdf?index=trueIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_4fc087adac454cc6b5e28ca73cfee49d.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_off0000df7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 4892 bytes
SHA-256: 9e61909798bcb53e4dab77f393eb88ab88d4a002017106615d219eab1830593d
font_01_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 10252 bytes
SHA-256: 129785516a2c05e03c4b7af1fcaefed8088841ba762609b9db776713ce29ecb2

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