Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55519a4bbaa56f7…

MALICIOUS

PDF

82.8 KB Created: 2021-03-25 03:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4977087b15c36f863df8016a0bba155b SHA-1: 0299a05000ea6088f8e527088e3206abfbf3ba7d SHA-256: c55519a4bbaa56f7b873c4fc19984a436509986ac0dc2c85057858497d7013e6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with the primary one being https://druttle.ru/award?keyword=biblia+de+estudio+apologetica+pdf+descargar. The PDF's structure and the presence of many external links suggest it's designed to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/award?keyword=biblia+de+estudio+apologetica+pdf+descargar PDF link annotation
    • https://cdn.sqhk.co/xaxovowupofa/jcMijjd/logo_quiz_level_209.pdfIn PDF document text
    • https://cdn.sqhk.co/jerowerar/jdji2jb/10_band_equalizer_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/derixosu/ibQjume/fifth_edition_character_sheet_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vuramufef/ehhwBic/33935703285.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/IxvhioS/65604494952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450428/normal_601f39952e900.pdfIn PDF document text
    • https://cdn.sqhk.co/tidapavibu/Eighdji/diwosurofim.pdfIn PDF document text
    • https://cdn.sqhk.co/gizafimode/gejbejc/rounded_sheetrock_corners_or_square.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/XgcX9IY/kireloma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_601bac9c954ce.pdfIn PDF document text
    • https://cdn.sqhk.co/fotenulutis/ieoHZje/megabot_flying_robot_car_transformers.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/gezizefefififa/solution_design_document_template_ppt.pdfIn PDF document text
    • https://bb209e34-24c3-4901-88bd-c00af8cda710.filesusr.com/ugd/de6798_e28d83da51454859baea86145cba3689.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_c8499586bda14c77a91acbff22b13ebd.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_f5593587076540c99ad06982ee35a200.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_ec7e05eef2e044028a20823aaadda6a6.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_4659cf5afab44f71b516aa2a6f5bb60c.pdf?index=trueIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_10c71c448cba4cdfb35b19195e08aa6d.pdf?index=trueIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_e2d3a4c683654fbebe768a3fefca7842.pdf?index=trueIn PDF document text
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_25f4fd9d514a4b659f812ed1b5e429d0.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_ccef69bee37c495e88a4b9c977c4b92c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/cambridge_checkpoint_math_workbook_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/how_to_use_smart_bro_zte_pocket_wifi.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/passive_design_strategies_architecture.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_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 5512 bytes
SHA-256: 59ee9a8b02fa0bf6d878ae1a22e70e5521251f2f9d7171ea0f52621d83fba2a2
font_01_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 13532 bytes
SHA-256: afa0d8332f86808c88820433967f8a860d78c4f36eeb2577a5df27b9f1ff01b2

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