Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3eca0941d42a91…

MALICIOUS

PDF

82.6 KB Created: 2021-03-22 01:14:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 49fe86615ba086414ac55cd36807ef09 SHA-1: 2f6f209b5b2765da531c206099eb0ab9dcdb0f36 SHA-256: ca3eca0941d42a913c850690cdafba15bbd46039cdff2b11f532a2a28bec2a97
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm used for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://seumenha.ru/award?keyword=laundry+business+proposal+pdf PDF link annotation
    • https://bumozirejukije.weebly.com/uploads/1/3/5/3/135340746/lifebaguzinin.pdfIn PDF document text
    • https://nakidero.weebly.com/uploads/1/3/4/5/134524904/5866421.pdfIn PDF document text
    • https://rupulosulokor.weebly.com/uploads/1/3/4/7/134773135/821ea4.pdfIn PDF document text
    • https://neranoliva.weebly.com/uploads/1/3/4/2/134266014/vufovovinikunuf.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/50487152892.pdfIn PDF document text
    • https://metuwudoguwo.weebly.com/uploads/1/3/5/3/135323448/paguguriziwiwer_porebi_mozowebuxopi_fuxofivu.pdfIn PDF document text
    • http://dapajurop.mygamesonline.org/probability_and_statistics_formulas_and_examples.pdfIn PDF document text
    • http://rezanufeku.mygamesonline.org/livazatafogebif.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/gumip.pdfIn PDF document text
    • http://xibomupazone.mypressonline.com/79473822125.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/88a54b.pdfIn PDF document text
    • https://wewowalowumuv.weebly.com/uploads/1/3/4/0/134040384/6126440.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3228dc58-b2c1-4aed-ac20-03fc52793822.filesusr.com/ugd/43afbb_e78b429041b347dcb333fb51d7709df6.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_cd6394b5d8a7420db9b7c1ebcbf196e0.pdf?index=trueIn PDF document text
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_5b332a0d2c6346d6ab7f1d24d5539e3d.pdf?index=trueIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/rent_stabilized_lease_agreement.pdfIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_bb538c3697c840138939c8e3461dae1e.pdf?index=trueIn PDF document text
    • http://ferodibev.onlinewebshop.net/statistical_quality_control_books_free_download.pdfIn PDF document text
    • http://movuzawizigevej.myartsonline.com/27891341934.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_38c8d316146943929a91963aad6acf00.pdf?index=trueIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_241cec7fac2241c3bfe9b17f23d0e1e7.pdf?index=trueIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_ca4af75bf44b4e2b891afcbeec45b2c8.pdf?index=trueIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_079a6779678b443093cfe55a7be9bb3e.pdf?index=trueIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/daxosozejofoxawoxo.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_b3529d0a4c1049d8853be55361b54977.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_c11cbf19436a401691e9f4d1a0905efb.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_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 5216 bytes
SHA-256: 20df0156037c372caf0f7c3c3ec899ea0e33db55fe2d2d2750befa0a4a1c0c47
font_01_sfnt_off00011850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11850 10568 bytes
SHA-256: 2a30594bef8859836f2494d2af86046a1bb51bd6d1272567d3b0fb33c4ca8240

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