Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a41a81af0e45e5c…

MALICIOUS

PDF

79.4 KB Created: 2021-03-17 15:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e38f935fe087d7adc5001721810909d9 SHA-1: 5cc7aee6c5427b6ae3347a2ff190bfba258b2b65 SHA-256: 8a41a81af0e45e5c793391d7c287d4046f42588308b0b752714339d67eab8fd3
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as part of a link farm, containing numerous external links, with a primary URL pointing to 'maypoin.ru'. The document's content, though appearing to be about weight loss smoothies, is likely a lure to drive traffic to these external sites, which are part of a broader link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://maypoin.ru/award?keyword=smoothies+for+weight+loss+pdf PDF link annotation
    • https://cdn.sqhk.co/negixakozaxu/giVHjcs/multi_stream_obs.pdfIn PDF document text
    • https://vezikiga.weebly.com/uploads/1/3/0/7/130739663/6487182.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/mRhggfK/kaganovedevijewuvowex.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/hjhfhgj/screen_recorder_application_download.pdfIn PDF document text
    • https://fitikuwez.weebly.com/uploads/1/3/2/6/132681307/nenoxikamozepel.pdfIn PDF document text
    • http://dasopupure.iblogger.org/wifujulovasalaxaridujaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/3cPig8X/cake_decorated_with_macarons_recipe.pdfIn PDF document text
    • http://tuvimokasodo.22web.org/personal_bio_data_format.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/kiguteperilodu/kalesekosuxosu.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/play_store_app_on_my_laptop.pdfIn PDF document text
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_ef2f25819a83437b8dd5d4f28a9a897a.pdf?index=trueIn PDF document text
    • http://wuboxobotuz.rf.gd/abraham_lincoln_books_in_marathi.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_5b0b3eb99bfe4ae2a94491473224dae0.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_9d661bdcfa0d4511abf7a00f84d54645.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_117aa4795c4945f693a1004bea0e4cbf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/58914856517.pdfIn PDF document text
    • http://wixobopi.rf.gd/how_do_computers_work_step_by_step.pdfIn PDF document text
    • https://77abcf6a-1f47-4233-a5f7-28832101be0a.filesusr.com/ugd/e29e5c_1b05f5b9b5a04d8e9a4001d5e5a58793.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomuper/information_about_bantu_self_government_act.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_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 5440 bytes
SHA-256: f53403b23eb827dd24a32b7e9219ff9edf674bb11a295c4e0c5bac44968a6861
font_01_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 10792 bytes
SHA-256: 91416d8b69435e1eaac2e1f8905597bff32fe45df3f3582a61e0f414c6fa4db6

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