Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac882f329c955c87…

MALICIOUS

PDF

79.3 KB Created: 2021-03-15 00:03:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 27dd7b897e610cef3c1e93c62261ce9f SHA-1: 0724c0f6f4962f9666a679d768385f718dac5dfa SHA-256: ac882f329c955c87e92fdf0c9a96a3efa0237dc7efb30c81efabf69943c1aa80
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, flagged as a 'PDF_SEO_LINK_FARM'. One of the primary links, 'https://seumenha.ru/wix?keyword=uci+math+peer+tutoring', suggests a potential SEO manipulation or phishing lure. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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.
  • 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/wix?keyword=uci+math+peer+tutoring PDF link annotation
    • https://mesajenijapab.weebly.com/uploads/1/3/0/9/130969967/7632105.pdfIn PDF document text
    • http://zovolexune.sportsontheweb.net/the_anglo_saxon_chronicles.pdfIn PDF document text
    • https://wubugijesagaro.weebly.com/uploads/1/3/1/4/131437106/soduzupawovufakis.pdfIn PDF document text
    • https://jumitugiputetiv.weebly.com/uploads/1/3/5/3/135313018/tugonip.pdfIn PDF document text
    • https://dixugoruvaweg.weebly.com/uploads/1/3/4/6/134616472/fenavuvifajexe.pdfIn PDF document text
    • https://tezexitebab.weebly.com/uploads/1/3/4/6/134600353/a1e44fe0674f305.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/80a0de9e-a445-4b90-b4b6-b67d028e0135/how_to_replace_internal_hose_on_dyson_dc41.pdfIn PDF document text
    • http://mawokale.myartsonline.com/falurafaboxufe.pdfIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_647165178810476990dfe0730a4a15f0.pdf?index=trueIn PDF document text
    • http://nununad.myartsonline.com/83041093217.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/artificial_intelligence_notes_anna_university.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/gukovolajuzevoxesubikavuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/187384cf-7fb8-4f1e-87c8-139a74d82c85/gedosidiradebexusefewexem.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/impulse_response_utility_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484fae1c-3613-4381-acb9-60c38d2b50da/spotted_lanternfly_eggs.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/angelique_kidjo_agolo_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/what_is_the_shortcut_key_to_take_a_screenshot_in_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/skyrim_how_to_speed_up_time.pdfIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_69452458c1e94ca4b514aceba394c5be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/banana_tree_vector_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/76977567704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add398c8-ea05-440f-a1c2-bb85c95a4b8e/69199238727.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/69701767837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce44e0bc-eb4b-459d-a6f6-aa40dfc888b6/23809218449.pdfIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_0f52b91f7f5f4d899d85d23234b9eab9.pdf?index=trueIn 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_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 5128 bytes
SHA-256: 0cb716dee35fa1ec4b435f716a935cd73a80ccd5f8444a5e4fe8970e459ded8d
font_01_sfnt_off00010b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B94 10592 bytes
SHA-256: 84cf16dde43a0c3a2da2fffca08e4f03d7422c773d0ae9605c290ea58f69cf83

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