Malicious PDF — malware analysis report

Static analysis result for SHA-256 595a533eb6746e85…

MALICIOUS

PDF

75.6 KB Created: 2021-02-14 20:32:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: de7cc8c981dc3242c329cfca3b76f0d1 SHA-1: 1bc1ea49b157dcad821808403e281357a555c249 SHA-256: 595a533eb6746e85640ebdacf8b9e468c17b3a11422bb87b5aa76b06e2ae2c33
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs suggest the document is part of a link farm designed to direct users to potentially malicious or SEO-manipulating content. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct instructions or lures are discernible.

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=artemis+berlin+reopening PDF link annotation
    • http://regvoolkim.website/calculator_windows_xpncjxe.pdfIn PDF document text
    • http://silver35.ru/48657310069j7604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368242/normal_60170a48e0e01.pdfIn PDF document text
    • http://kartaidatodemeleri.com/iddarammayilatho_violin_ringtone_free_download4isqh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_600ac7f489d4b.pdfIn PDF document text
    • http://ig-support-service.com/hells_angels_tennesseen4cnq.pdfIn PDF document text
    • https://gitujibexilen.weebly.com/uploads/1/3/1/4/131406430/3152084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5fd6394b7c39c.pdfIn PDF document text
    • https://cdn.sqhk.co/kupemopo/iNQhjhb/rabbit_running_around_circles_road.pdfIn PDF document text
    • https://cdn.sqhk.co/fekolisuzub/cXhdhdx/80949751104.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366408/normal_5ff36a126195b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_602618e5614d3.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/egtjggi/fugikifupumaxijoni.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwobevina/eidiehb/go_street_view_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/hbhhVja/dedusunebeg.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/boduxatavepe/recommendation_letter_template_for_masters.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/bc_b_caste_list_in_ap.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/ismart_shankar_dj_songs_audio.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_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 5056 bytes
SHA-256: 253618b36ba3ed9c98becf26942b624b55fa572dca7e94caf8975ad1b0e1eee4
font_01_sfnt_off0000fd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD55 10440 bytes
SHA-256: d238f6402361dbec53bcd18bac51a631d80d8c09245b866723a61117ade00586

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