Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d5336b6fc3439c…

MALICIOUS

PDF

75.1 KB Created: 2021-04-08 00:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f7ac37d258f5ced766982c579e708e29 SHA-1: e4dd2a650983f2586df425db922621130973042a SHA-256: 91d5336b6fc3439ce7e215c95129e7185fe67fe90fd9195dd5cf69748b7953e5
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to disposable hosting or domains with unknown reputations, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

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://kuzutuzo.ru/123?utm_term=filezilla+ftp+server+mac PDF link annotation
    • http://edayafar.xyz/posuresisorakabeomrq8.pdfIn PDF document text
    • http://funewiwawako.iblogger.org/lidoselomagisomomebuto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_5fd0e8b68cc1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_603c55966691c.pdfIn PDF document text
    • http://datinge.site/why_wont_my_onn_headphones_connectdrg26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_6007553168e84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453729/normal_603555a3e4f1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422645/normal_601b9f50e9242.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_81b618d014aa47db9dacb46777119d28.pdf?index=trueIn PDF document text
    • http://gakupoxefale.epizy.com/algebra_1_summer_review_packet_answer_key.pdfIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_40e1bfd4ed154ad1a6e42369f4e7068a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/limewub/24092824783.pdfIn PDF document text
    • https://dd3a609d-fcd9-461e-ae06-f7e9ec6f332d.filesusr.com/ugd/811c3f_d137f9dcd4494f7fb8f479ad3c847902.pdf?index=trueIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_64249330cc9e418a8772ec9715016920.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/what_does_god_say_about_reality.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/zijufepeberogilu.pdfIn PDF document text
    • http://palalujopaxuv.epizy.com/lalegetudufemilum.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_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 5228 bytes
SHA-256: 2473b9f2553228231b18971079f4673292e23ab2c9c5603cdb2081a27c20eedc
font_01_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 11280 bytes
SHA-256: e236fdb40ad1144681027b73755d9d898885b7233b22ed6c9894ca41136a1906

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