Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c9ac014263b68a…

MALICIOUS

PDF

76.9 KB Created: 2021-03-13 14:00:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bd4638f92ebff9da268dec03865d3680 SHA-1: aea65e9f115de5ee65d280113159dfc41be37dea SHA-256: 79c9ac014263b68a85e000e3a6a54d050bb767c959a9e4aa67d0f2aaefeaa5b0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate the presence of a link farm with numerous external URIs, including 'https://resalured.ru/strik?utm_term=m+s+word+2010+shortcut+keys' and 'http://healthytrands.com/14611621322loxdb.pdf'. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and heuristic firings strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=m+s+word+2010+shortcut+keys PDF link annotation
    • http://healthytrands.com/14611621322loxdb.pdfIn PDF document text
    • http://best-store.club/how_to_make_bluetooth_speaker_videozapsk.pdfIn PDF document text
    • http://timinipitos.22web.org/excell_pressure_washer_xr2600_replacement_pump.pdfIn PDF document text
    • http://newberginvestmentproperty.com/bayesian_analysis_with_python_download6p7tj.pdfIn PDF document text
    • http://buvemalo.66ghz.com/36026376534.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_4f40faa08f9c4e24bd8a6acd9b1ed7e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af6922d-4cd8-46a4-911c-d5523ab74324/faninerilumemavorel.pdfIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_6fec0b906e0c4479999c8e07054dee5c.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_729d546c4fd140ecbc5044886b508abe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f463b4d-4316-436d-bed4-aad888bfe827/2_hour_job_search_lamp.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_8f130d6d470048c8849ab591ad769e0b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42078167-85a4-40c4-9110-bba0740cdac1/how_to_work_out_the_mode_median_and_mean.pdfIn PDF document text
    • https://ac25a69f-a984-4293-9c3d-8c9e0f062535.filesusr.com/ugd/cbf077_35f5adc6c6ab4d45ad9916c0fea49407.pdf?index=trueIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_04343bebbbb04c6fbf1190c79fada58c.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_c68af235a5da48858218acac3b8caa67.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_d46fa7c71c454060a932ca5b0bb6181e.pdf?index=trueIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_f5f72a59a36f4152853b0f78d368f8f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d2b5c6-e6aa-4141-963a-18f158666a00/movie_review_template_for_elementary_students.pdfIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_e9dd90bfe616423a88294f16a7c70129.pdf?index=trueIn PDF document text
    • http://misibinebob.epizy.com/alternative_answers_to_thank_you.pdfIn PDF document text
    • http://xawosote.epizy.com/26364033689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0cee90-e7a1-4664-8a1b-8e4f319a27b6/xomobozezogokidulujuz.pdfIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_0020dc4acda0408fb19455c8a08ec0ea.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_5fa8a204a4e345e3b6dadac15072a53e.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_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 5372 bytes
SHA-256: 221c6b0db54bcc649fcaf2a142761d7806feda56e3c459515b875448be607a4b
font_01_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 10464 bytes
SHA-256: a2307e4311bc0815062afb7301c080fbfd876efad1a43798dd01fc253ad81c20

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