Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd387457db8e1d9…

MALICIOUS

PDF

75.1 KB Created: 2021-04-06 03:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b8d385dc41c70892af40355f16ac29f9 SHA-1: ab208be4550c18efb46893266ab799554fa88fd1 SHA-256: 1dd387457db8e1d93dc9d6e40a9ddf86686a455670c48e8ff00fdfe4f9d536c6
156 Risk Score

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 0.9997

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://ponafet.ru/wix?keyword=naruto+apk+3v3 PDF link annotation
    • https://fafodedok.weebly.com/uploads/1/3/4/6/134602811/papabuvisimiwar.pdfIn PDF document text
    • https://nuzikufu.weebly.com/uploads/1/3/4/7/134766145/bawato-sorexebawed.pdfIn PDF document text
    • http://bogipeborowe.sportsontheweb.net/nosql_database_types.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/nikon_coolpix_s3100_camera.pdfIn PDF document text
    • https://pomaxobizo.weebly.com/uploads/1/3/1/1/131163853/4722732.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/lakadutof/stargirl_jerry_spinelli.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/42590510616.pdfIn PDF document text
    • https://ae40ec61-d20a-40a8-9c94-208d4569f534.filesusr.com/ugd/5d0862_1dad80bbe2a4493dbbb6420a8d68a90c.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_4a1ce0ea4a5949cfb9e583755b083e61.pdf?index=trueIn PDF document text
    • http://naxesabefadufu.atwebpages.com/atomic_structure_class_11_formulas.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/dd_3.5_wizard_spell_slots.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/swordsman_leveling_guide_ragnarok_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/2002_ford_explorer_sport_torque_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/bastille_rhythm_of_the_night_piano_sheet_music.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_38ee831c28e94152ac9d285926bd76a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/kanederad.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/97942920438.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/amazing_marvin_android.pdfIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_e08c5519a8304fe988719b84e6c0368e.pdf?index=trueIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_23ff03f56acf4f7ba8d48c13156dcf32.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_off0000e885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 4860 bytes
SHA-256: f3208c49335088263566de38857e4295cb9cd421801bc41d98541c898b9f9431
font_01_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 11656 bytes
SHA-256: 5489d91a6bd942c80a3c092856b63d9c9aedbf275b6879782e49b9bf0b6ab330

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