Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bf3e01cf437df3…

MALICIOUS

PDF

86.4 KB Created: 2021-03-01 08:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7f9d5d2fae87add867df65ae4d288502 SHA-1: b643142687fcf1f01e420df467199bfcf5388875 SHA-256: 53bf3e01cf437df36d25bb31f9ce0cb1872ecb2eac36301c4cf758a66f9e4f20
186 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable domains, characteristic of a link farm or SEO spam. One of the primary URLs extracted is 'https://seumenha.ru/award?keyword=why+do+breathing+exercises+work', which appears to be a lure. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest it may be used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=why+do+breathing+exercises+work PDF link annotation
    • https://cdn.sqhk.co/bamosabubesi/tjjMqid/63650728303.pdfIn PDF document text
    • http://marelosolato.iblogger.org/executing_stored_procedure_using_spring_jdbctemplate.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/geriehi/givimatavajokesojij.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/idvXhfl/best_multiplayer_word_games_iphone.pdfIn PDF document text
    • https://xazebuwojij.weebly.com/uploads/1/3/4/4/134467588/a9fc9cee9b708d.pdfIn PDF document text
    • https://cdn.sqhk.co/jipuxoxukul/z04Khf2/batigomur.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/6217874.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/loxefira.pdfIn PDF document text
    • https://nirereki.weebly.com/uploads/1/3/1/4/131483126/sotifejadoni.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/lososimap/tavovosatazub.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/25650840305.pdfIn PDF document text
    • http://juvokumepi.rf.gd/26989151715.pdfIn PDF document text
    • http://vezufokat.rf.gd/almyra_font_free.pdfIn PDF document text
    • http://pasebuda.epizy.com/26307015345.pdfIn PDF document text
    • http://vapelokalun.epizy.com/zafepaxarufaxedaxixebam.pdfIn PDF document text
    • http://babevuzax.epizy.com/third_person_singular_worksheets.pdfIn PDF document text
    • http://pepisip.rf.gd/81609634963.pdfIn PDF document text
    • http://dunupilopun.epizy.com/business_environment_book_for_mba.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_off000115f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F9 5648 bytes
SHA-256: a4569b185c062ce16e181a1004cafefe5423f34fbcf5a9e6360f0d2912d61936
font_01_sfnt_off0001294f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294F 10196 bytes
SHA-256: 91e8791f5de1eb286774fc8c3b0a46941f2047255b1adf709f7bd5ccb16780b1

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