Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0215f1956107c4…

MALICIOUS

PDF

72.4 KB Created: 2021-02-16 08:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3126f6ce97679475fb0967050aca6747 SHA-1: 3ff5567f4c67c6af3ee54603f5f239b927d40d79 SHA-256: ef0215f1956107c412c049aa2988726404aed33d755c591dcab747598e9154fb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm designed to distribute SEO-optimized PDFs. One of the primary external URIs, 'https://druttle.ru/wix?keyword=physical+science+concepts+in+action+answers', suggests a lure to a website disguised as a search result. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/wix?keyword=physical+science+concepts+in+action+answers PDF link annotation
    • https://dimavuvinidet.weebly.com/uploads/1/3/1/3/131397938/pomomebimipiluk_menijabisolib_xusoxamutu.pdfIn PDF document text
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/dawal-bowepakixanob-buban-xelitinuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449417/normal_5fea08b9dae2c.pdfIn PDF document text
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/larikuzikem-sijuzige-nonisatukiteba-busaxuwe.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/e0ded474e894c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405430/normal_5fe6c416ef40a.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/purufiz/xoketej.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/dc_motor_with_encoder_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/apb_full_form_in_accounting.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/62814850964.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/volume_of_irregular_shapes_with_cubes_worksheet.pdfIn PDF document text
    • http://zaruxokogidut.epizy.com/nutriment_feeding_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/milestones_menu_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/ar_381-_11.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/benjamin_constant_principes_de_politique.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/artioscad_manual_en_espaol.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_off0000d1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F9 5216 bytes
SHA-256: 2b705ecfd39ac9a94293d76dcc430e6d26c0153a406836de03b638c85ae08284
font_01_sfnt_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 15716 bytes
SHA-256: fb3f1b1f6a29dccf1d4ec9a310386bcaedaeef2f3a46758a2646a8c3a6e6a227

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