Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4cad0c7132e8b7…

MALICIOUS

PDF

82.2 KB Created: 2021-02-15 22:38:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 330376a107a1137a4b4b9576cf7cd33c SHA-1: 940830ad7341d25feda3727f9f995c693bc3ae99 SHA-256: 6b4cad0c7132e8b7f72337a65f480182936bea72ece2aa63e5d25db4d0ece0e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or ad-revenue generation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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 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://leonvi.ru/wix?keyword=types+of+triangles PDF link annotation
    • https://livorenofog.weebly.com/uploads/1/3/1/1/131163774/kafebuvepopulujagik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476925/normal_5ff0ea34a7329.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461205/normal_5fceb9d791065.pdfIn PDF document text
    • http://difavusimope.iblogger.org/luxenawotopusobuxuzu.pdfIn PDF document text
    • http://wewudiwiwojob.22web.org/hard_bass_dj_song_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465133/normal_5fe79b2e89209.pdfIn PDF document text
    • http://kaxogibigonubib.22web.org/suudi_arabistan_tarihi.pdfIn PDF document text
    • https://tomavibevojivow.weebly.com/uploads/1/3/4/0/134016690/jevineb-sizawo-ravumitavu-xajinefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471969/normal_5fe722127db05.pdfIn PDF document text
    • https://gobodukigibab.weebly.com/uploads/1/3/1/8/131856162/japedomubuduj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5fd87457681b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vivazuriperulus.epizy.com/alternative_energy_sources_reading_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/hd_movies_website_in_india.pdfIn PDF document text
    • http://sanejiwobar.epizy.com/ranevijup.pdfIn PDF document text
    • http://pevutedijubixit.epizy.com/athabasca_rcmp_report.pdfIn PDF document text
    • http://ximedamolaxeve.epizy.com/ip_calculator_subnet.pdfIn PDF document text
    • http://zelejiv.epizy.com/avast_secureline_vpn_license_key_free.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_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 5120 bytes
SHA-256: 08dd90e091cd3aba5f95b9df431ef16cb0771d5299b76e7853e8b2b6f2030d61
font_01_sfnt_off0001176a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 10644 bytes
SHA-256: 8d1e85a889939b271ed1490379fb818fda974baa7e00721cdf6966ed7ebf3bdd

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