Malicious PDF — malware analysis report

Static analysis result for SHA-256 c452496c2738b39e…

MALICIOUS

PDF

77.8 KB Created: 2021-04-06 03:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03114e26ed8edfae175f0a6f62bbe87c SHA-1: d7a474b6358c850c25fe5f259efe216687c607c9 SHA-256: c452496c2738b39ee716aa15fafecb9099d50f9b23f5ce2195de809618646764
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://maypoin.ru/award?keyword=loan+application+form+pdf+file
    • https://vewefididijos.weebly.com/uploads/1/3/4/5/134517371/kutazamofukujilerid.pdf
    • http://bunagutafa.getenjoyment.net/multiplication_worksheets_grade_5.pdf
    • http://wipunemobak.mygamesonline.org/similarity_proofs_worksheet.pdf
    • http://mesikigodijope.mypressonline.com/mind_mapping_techniques_for_brainstorming.pdf
    • https://bewebisiseten.weebly.com/uploads/1/3/0/8/130874130/lotof.pdf
    • http://nebemor.mywebcommunity.org/wekavodagoburix.pdf
    • https://jofukesor.weebly.com/uploads/1/3/3/9/133999831/nozudiroke-jusolujiv-fiwurel-mipesabid.pdf
    • https://xuloxaxofe.weebly.com/uploads/1/3/5/2/135294954/rapivimiz.pdf
    • https://monisobagarov.weebly.com/uploads/1/3/1/8/131856119/6749600.pdf
    • http://jarowulizose.sportsontheweb.net/degradacin_de_suelos.pdf
    • http://fipagolanikobax.mygamesonline.org/systemic_vasculitis.pdf
    • http://wadipogi.medianewsonline.com/5th_grade_math_staar_practice_worksheets.pdf
    • http://tepifugamokeg.medianewsonline.com/sig_sauer_p365_holster_owb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tefetuzuzip.myartsonline.com/30264090488.pdf
    • http://wiloradakuno.onlinewebshop.net/simplification_and_approximation_questions_for_sbi_clerk.pdf
    • http://nibopinalilabaj.onlinewebshop.net/assembler_en_un_seul_fichier.pdf
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_29df53090bfc42588843af310e2c6946.pdf?index=true
    • http://mevuxuru.atwebpages.com/brahmagupta_biography.pdf
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_6c06ea3fbff44bc7a911e2ee138e5b17.pdf?index=true
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_03f6d3bc7cec41d184eae259f02b0f40.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f7.bin
a5005b7a11f60c5ec07bc558b8674ba7850a43293870c7aaa23cf2f12cca9cfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 4852 bytes
font_01_sfnt_off0000f751.bin
6eb99d92d2569ce1dec1a07b841199f03dba0ea8f923d28fde671e07e24e9d52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 10536 bytes
font_02_sfnt_off00011b51.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 4324 bytes

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