Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3db2d4e1491cdb…

MALICIOUS

PDF

75.7 KB Created: 2021-03-20 20:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f0e7818581f682324b6fe26ecfa47b83 SHA-1: 9518af7e7a1616116a15cfa2e74a4b4b5d805905 SHA-256: 6a3db2d4e1491cdb322b53934946a0749429b2ddb69f53901be63ea6da5f6728
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://nipisod.ru/123?utm_term=double+facts+worksheets+free PDF link annotation
    • https://cdn.sqhk.co/lanumakefu/GTMhdET/petogumupolizoj.pdfIn PDF document text
    • http://jedugefipevama.iblogger.org/electron_configuration_rules_worksheet.pdfIn PDF document text
    • http://rijebutaj.22web.org/how_to_put_up_in_ground_basketball_hoop.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/fuirq9c/33438441549.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xapimiwosusuv.epizy.com/nepukiporojezediberiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/957d7b56-c672-4181-9c33-d56f962c2c00/diferentes_tipos_de_grupos_funcionales.pdfIn PDF document text
    • http://surobufalinaxis.epizy.com/55245508005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cb1bf2a-3f27-47a0-86a7-df5f8e5f9e4f/61710081713.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_5a525098d650493d82bf5ccfa5c06e84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0062b17-59f7-48c6-a09d-4f1c23ffb1b0/99561542841.pdfIn PDF document text
    • https://9c8f49e5-5895-4656-bc53-c560b1a0ede3.filesusr.com/ugd/0f7a6f_46d2513e4210478a8008cd4016ff9642.pdf?index=trueIn PDF document text
    • http://muwaziri.epizy.com/sezixogajekujiworojofowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4918e6d-b191-4b2f-bdf8-1fc366eaae1e/furala.pdfIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_cf9c531cabf64453aa71d3ce5e982af6.pdf?index=trueIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_966645505cd84504bf8266b523029d29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/892524cd-d907-4a51-b913-11c56d7441c3/is_there_a_totally_free_criminal_background_check.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0752f0ef-2706-43f5-b7b9-441838db8e38/paris_rhyme_words.pdfIn PDF document text
    • http://niwaraz.epizy.com/kolapugor.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_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 5264 bytes
SHA-256: 65eeb075daeabcc223a27dffa3fddb6a23a4a3e5bebd8e29620fb3767ee3e562
font_01_sfnt_off0000fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 10520 bytes
SHA-256: aeaa8c25fe2333a06eabee01a9228c64728f59eb2ae81dd73891a8488e6c5e0e

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