Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1af2f2dacaf5f34…

MALICIOUS

PDF

100.7 KB Created: 2021-03-30 17:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 75a85e7156f5c2e9d183d1ae55780a0a SHA-1: 2193e7a7faded3ab7f152e6bdb7b058482d5f61a SHA-256: a1af2f2dacaf5f34fcd267b828476009ee365050ef392775629dcf7e02d366fa
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. One prominent URL, 'https://jottigo.ru/award?keyword=auditory+pathway+pdf', appears to be a lure for users searching for specific information, likely leading to further malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites, fitting the pattern of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/award?keyword=auditory+pathway+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487622/normal_605586d9d1e99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419826/normal_600a7eb295e1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403276/normal_6031363d1e214.pdfIn PDF document text
    • https://cdn.sqhk.co/tamenotu/hjfihd5/what_is_the_christianity_symbol_mean.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuzijix/hljd2gj/47927000916.pdfIn PDF document text
    • https://cdn.sqhk.co/sudidoxa/yhBlji5/7073451851.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_2731cf76241c423382c5216e270625dc.pdf?index=trueIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_9142150300174c75a5362bc3fa12bb8a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefipa/39726953359.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_585cbce044734327b13a175a5411e8b9.pdf?index=trueIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_07b2767d57864aa583b9858299114b04.pdf?index=trueIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_971b7c69c1cd436e8011105e61207303.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_fbc5015d25ae4d50afb27e0934fc6051.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/bosowene.pdfIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_828a953580cf41abb0ca7b7dcab9d493.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_91d75dacebaa499a982c0a44c5b8e84a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/xuvigiwaza.pdfIn PDF document text
    • https://43a98339-0465-49d0-a416-8cef4780896f.filesusr.com/ugd/89258f_8438058269e6471b951bb08ec76928b1.pdf?index=trueIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_bd939725d1d7499a8d027501fe8d741d.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_c968536bcb5046ecbef7c2f889a82b3f.pdf?index=trueIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_43fb4666b2ef416594b3b624e868f522.pdf?index=trueIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_60269b2dfdb94532a6ca0041c5d4185b.pdf?index=trueIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_8d0ba73744d34e4699a1366d164f21fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vojapu/95993999387.pdfIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_d506898098464b7f87f42e97ab185db1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dosipive/trimble_access_manual_tsc3.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_off00014a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A82 5104 bytes
SHA-256: 545195ca8643ac547d619e51f99208aa3cd22ebf46ed4a7507f94720557b5a3b
font_01_sfnt_off00015bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF3 12212 bytes
SHA-256: f0fbd3b69db1fba38f6675f4f96c40fa7b5d3c87035a5bd4ef3e2445c88dfe55

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